JP2008200953A - Electric power vertical injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a heating cylinder from falling down during nozzle touching and control an injection screw so as to achieve its smooth movement and correct positioning during injecting/batching by ensuring smooth ascent/descent of an injection device along a guide rail. <P>SOLUTION: This electric power vertical injection molding machine 1 is equipped with an injection device 7 of the following constitution: a front plate 11 is supported by guide rails 5 and 5 on a moving platen through direct-acting guides 6, the device 7 is lifted by an injection device lifting means with a ball screw mechanism B2 to the moving platen along the guide rails 5 and 5, and an injection nozzle of the heating cylinder 8 is made to come into contact with and move apart from a movable half of a mold. In addition, the heating cylinder 8, a motor for screw rotation, a motor for injection 17 and each axis C1, C2 and C of the ball screw mechanism B2 pass through the center Co of the guide rails 5 and 5 and are arranged in one straight line L orthogonal with a straight line Lo connecting each guide rail 5 and 5 together as viewed on a planar angle. Further, the axes C1 and C2 of the heating cylinder 8 and the motor for injection 17 are arranged opposite to each other with the axis C of the ball screw mechanism B2 located in between. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric vertical injection molding machine having an injection device erected on a movable platen of a vertical mold clamping device.

Conventionally, as an electric vertical injection molding machine, a pusher plate is connected and supported via a ball screw mechanism to a front plate having a heating cylinder arranged in the vertical direction, and an injection screw inserted into the heating cylinder on the pusher plate. A screw rotating motor that rotates the injection screw and an injection motor that moves the injection screw back and forth in the axial direction in the heating cylinder by operating the ball screw mechanism are attached to the pusher plate. Is known (for example, see Patent Document 1). In this electric vertical injection molding machine, the screw rotating motor and the injection motor having different weights are attached to the pusher plate that moves together with the injection screw. However, the injection operation by the injection screw may not be performed smoothly.
In order to solve this problem, the front plate and the pusher plate are supported and guided by two guide bars erected on the upper die mounting plate (movable platen), and are aligned on a straight line connecting the guide bars. The heating cylinder is positioned and attached to the front plate, and the screw rotation motor and the injection motor are arranged opposite to the pusher plate so that the moments with the center of the injection screw as a fulcrum balance each other in plan view, There is known an electric vertical injection molding machine in which a balance weight is attached to a pusher plate to prevent a biased load from acting on the pusher plate and to suppress shaking during movement (for example, patents) Reference 2).
JP-A-4-168010 JP-A-10-309737

  However, in the electric vertical injection molding machine described in Patent Document 2, when two motors having different weights are arranged on the pusher plate in a balanced manner, the degree of freedom in installing them is limited. When the balance weight is attached to the pusher plate, the pusher plate is moved with the excessive weight added to the pusher plate, and the injection operation is performed. Therefore, it is difficult to accurately control the position of the injection screw. Further, each guide bar and the heating cylinder are arranged in a straight line in plan view, and the support rigidity of each guide bar in the direction perpendicular to the straight line is low, so that the heating cylinder swings in the direction perpendicular to the straight line. This is likely to occur, and there is a possibility that the injection nozzle cannot accurately contact the mold when the nozzle is touched.

  The present invention has been made in view of the above circumstances, and can smoothly guide and raise the injection device along a pair of guide rails erected on a movable plate or the like. It is an object of the present invention to provide an electric vertical injection molding machine capable of preventing the tilting of the nozzle, smoothly moving the injection screw during injection, and weighing and accurately controlling the position.

In order to solve the above problems, the present invention has the following configuration.
That is, the electric vertical injection molding machine according to claim 1 includes a front plate having a heating cylinder arranged in the vertical direction, a pusher plate that rotatably supports an injection screw inserted into the heating cylinder, A screw rotation motor that rotates the injection screw via a transmission mechanism; an injection ball screw mechanism that connects the pusher plate to the front plate so as to be movable in the axial direction of the injection screw; and the injection ball screw mechanism An injection device having an injection motor that moves the pusher plate relative to the front plate by operating the transmission plate via a transmission mechanism supports the front plate on a pair of guide rails so as to be movable up and down via a linear guide. And a ball screw mechanism that connects the movable platen and the front plate and is arranged in the vertical direction. An electric vertical injection molding machine that is moved up and down along the guide rail by an apparatus lifting means and is provided so that the injection nozzle of the heating cylinder comes into contact with and separates from the movable mold fixed to the movable platen The shafts of the ball screw mechanism of the heating cylinder, screw rotation motor, injection motor, and injection device elevating means pass through the center of the pair of guide rails in plan view and connect the guide rails. And each axis of the heating cylinder and the injection motor is positioned on opposite sides of the axis of the ball screw mechanism of the injection device lifting / lowering means. Yes.

  The electric vertical injection molding machine according to claim 2 is the electric vertical injection molding machine according to claim 1, wherein the injection motor is attached to the front plate, and the screw rotation motor is It is attached to the pusher plate.

  The electric vertical injection molding machine according to claim 3 is the electric vertical injection molding machine according to claim 1 or 2, wherein the pusher plate is raised and lowered to the pair of guide rails via a linear motion guide. It is characterized by being freely supported.

  The electric vertical injection molding machine according to claim 4 is the electric vertical injection molding machine according to any one of claims 1 to 3, wherein the axis of the ball screw mechanism of the injection device elevating means is flat. It is characterized by being arranged in the vicinity of a straight line connecting the pair of guide rails as viewed.

The present invention has the following excellent effects.
That is, according to the electric vertical injection molding machine according to claim 1, the ball of the injection device lifting / lowering means is on a straight line that is in the center of the pair of guide rails in a plan view and goes straight to a straight line connecting the guide rails. With the screw mechanism in between, the heating cylinder and the injection motor are placed opposite each other in a weight balance. As in the past, an injection motor and a screw rotation motor with a large weight difference around the heating cylinder are installed. Because it is not placed in opposition, it is necessary to install a lightweight screw rotation motor at a position far away from the heating cylinder in order to balance the weight of the heavy injection motor and to add a balance weight to the screw rotation motor The screw rotation motor and injection motor can be stored and installed in a small space, and the weight of the device can be reduced. And injection, the moving body moves with the injection screw is possible smooth movement and accurate position control of the injection screw made lighter during the weighing operation.
In addition, since the injection device lifting / lowering means can drive the injection device in the vicinity of the center of gravity by the ball screw mechanism, combined with the solid support rigidity by the linear motion guide with respect to the guide rail, the injection device is moved when the nozzle is moved. Can move up and down smoothly in a stable state without shaking, and the nozzle touch operation can be performed accurately.
In addition, since the heating cylinder and the linear guides guided by the two guide rails are arranged at the apex position of the triangle on the front plate in a plan view, the injection device is tilted when the nozzle touches. It can prevent suitably.

  Further, according to the electric vertical injection molding machine according to claim 2, since only the lightweight screw rotation motor is attached to the pusher plate and the heavy injection motor is not attached, The weight of the moving body that moves together with the injection screw is effectively reduced, and the smooth movement and accurate position control of the injection screw can be performed more accurately.

  According to the electric vertical injection molding machine of the third aspect, the pusher plate can be guided and moved to the guide rail firmly through the linear guide with respect to the front plate, and the shaft of the injection screw can be moved. Movement in the direction can be performed more smoothly and accurately. In addition, since the guide rail that supports and guides the pusher plate can be shared with the guide rail that supports and guides the front plate, there is no need to stand the guide rail for guiding and moving the pusher plate on the front plate. Becomes easy.

  Further, according to the electric vertical injection molding machine according to claim 4, the action point of the force for raising and lowering the front plate by the ball screw mechanism of the injection device raising and lowering means is positioned in the vicinity of a straight line connecting the pair of guide rails. Therefore, the driving force of the front plate by the ball screw mechanism of the injection device lifting / lowering means can be suppressed as much as possible from acting as a force to tilt the front plate against the guide rail. Can be performed more smoothly, and abnormal wear and damage of the ball screw mechanism of the injection device lifting / lowering means can be reduced and its life can be extended.

Hereinafter, an electric vertical injection molding machine according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 7, reference numeral 1 denotes an electric vertical injection molding machine according to an embodiment of the present invention. The electric vertical injection molding machine 1 has a pair of support columns 4 and 4 erected on a movable plate 3 of a vertical mold clamping device 2 and is fixed to the support columns 4 and 4 in the vertical direction. A pair of guide rails 5, 5, an injection device 7 supported by the guide rails 5, 5 via linear motion guides (linear guides) 6, 6, and a guide rail And an injection device lifting / lowering means 9 for moving the injection nozzle 8a of the heating cylinder 8 into and out of contact with a movable mold (not shown) fixed to the movable plate 3 by moving up and down along 5 and 5. Yes.

  Although the mold clamping device 2 is not shown, for example, a fixed platen is fixed to the upper surface of the machine base, and a triangle positioned above the fixed plate is provided at the upper ends of three tie bars 2a penetrating the fixed plate up and down. The movable plate 3 having a shape is fixed near the top of the triangle, an end plate is fixed to the lower end of the tie bar 2a, the end plate and the fixed plate are connected by a toggle mechanism, and the toggle mechanism is servoed. By extending and contracting with a motor and a ball screw mechanism, or by directly connecting the end plate and the fixed plate with a ball screw mechanism without using a toggle mechanism, and operating the ball screw mechanism with a servo motor, The movable plate 3 is moved up and down with respect to the fixed plate via the end plate and the tie bar 2a, and a fixed mold and a movable die attached to the fixed plate and the movable plate 3 are provided. DOO closing, those well known conventional configured to perform mold clamping.

  Rail support members 4a and 4a are fixed to the respective columns 4 and 4 over substantially the entire front surface thereof (the front side surface in FIG. 1, the right side surface in FIGS. 2 and 6 and the lower side surface in FIGS. 3 to 5). The lower ends of the rail support members 4a and 4a are fixed to the upper surface of the movable plate 3 with bolts 10a. The rear surface of the bracket 10 is the rear surface (the other side in FIG. 1, the left side in FIGS. It is fixed to the upper side surface in FIG. 5 with bolts 10b and is erected in parallel with each other, and upper ends thereof are connected to each other by a horizontal beam 4b to form a gate shape. And the guide rails 5 and 5 are attached to the front surface above the rail support members 4a and 4a by bolts 5a, so that the guide rails 5 and 5 are placed on the movable platen 3 via the support columns 4 and 4. It is erected.

  The injection device 7 includes a front plate 11 that is horizontally arranged in a rectangular shape in a plan view in which the heating cylinder 8 is held vertically (toward the vertical direction) and held at a position on the front side. Are fitted and supported on the guide rails 5 and 5 with balls or rollers interposed between the pair of upper and lower linear guides 6 and 6 fixed on both sides of the back surface. It goes up and down along. Above the front plate 11, a rotary shaft 13 connected via a joint 13c to an injection screw 12 inserted in the heating cylinder 8 so as to be rotatable in the circumferential direction and movably in the axial direction is provided by a bearing 13a. A pusher plate 14 that is rotatably held is provided in parallel with the front plate 11 at an interval. The pusher plate 14 moves up and down along the guide rails 5, 5, with the linear guides 6, 6 fixed on both sides of the back of the pusher plate 14 being fitted and supported by the guide rails 5, 5. ing.

  A pair of ball screw shafts (injection ball screw shafts) 15 and 15 located on both sides of the heating cylinder 8 and extending vertically upward are rotatable on the upper portion of the front plate 11. Ball nuts 16, 16 screwed onto the ball screw shafts 15, 15 are fixed at positions on the pusher plate 14 on the axis of the ball screw shafts 15, 15. The ball screw shafts 15 and 15 and the ball nuts 16 and 16 have a ball screw mechanism (injection ball screw mechanism) B1 for connecting the pusher plate 14 to the front plate 11 so as to be movable in the axial direction of the injection screw 12. It is composed.

  Further, an injection screw forward / reverse electric servomotor (injection motor) 17 with the output shaft facing upward is attached to the back side of the front plate 11 and is fixed to the output shaft of the injection motor 17. When the belt 17b is wound around the pulley 17a and the pulleys 15a and 15a fixed to the ball screw shafts 15 and 15, and the injection motor 17 rotates, the pusher plate 14 is moved with respect to the front plate 11, The injection screw 12 moves forward and backward in the heating cylinder 8. Further, a screw rotating electric servomotor (screw rotating motor) 18 with an output shaft facing downward is attached to the back side of the pusher plate 14, and a pulley fixed to the output shaft of the screw rotating motor 18. When the belt 18b is wound around the pulley 13b fixed to the rotary shaft 13a and the screw rotating motor 18 is rotated, the injection screw 12 is rotated. 2, 4, and 7, reference numeral 15 b denotes an idler pulley that guides and tensions the belt 17 b.

A bearing box 19 is detachably fixed to the support portion 10c provided at the intermediate portion in the vertical direction of the bracket 10 via a flange portion 19a. One directed ball screw shaft (nozzle touch ball screw shaft) 20 is supported by a bearing 21 at its lower end, and is provided so as to be freely rotatable about the shaft in an axial direction. A ball nut 22 that is screwed onto the ball screw shaft 20 is attached to the front plate 11 on the axis of the ball screw shaft 20.
The ball screw shaft 20 and the ball nut 22 constitute a ball screw mechanism (nozzle touch ball screw mechanism) B2, and the axial center C of the pair of guides in a plan view as shown in FIGS. It is on a straight line L passing through the center Co between the rails 5 and 5 and perpendicular to the straight line Lo connecting the guide surfaces of the guide rails 5 and 5, and only a small distance e from the position of the straight line Lo (for example, a ball About the diameter of the screw shaft 20) It is arranged at a position close to the heating cylinder 8 (position near the straight line Lo).

  The heating cylinder 8, the injection motor 17 and the screw rotation motor 18 are arranged with their axes C1, C2 and C3 aligned on the straight line L, and the axis C is in between. Thus, the heating cylinder 8, the injection motor 17, and the screw rotation motor 18 are positioned on opposite sides. The position of the axis C is set within the range of the distance Lo on the straight line Lo or on both sides of the straight line Lo depending on the arrangement position of the injection motor 17 and the screw rotation motor 18. The position of the axis C is the position of the center of gravity of the injection device 7 or the vicinity thereof.

  A motor with a speed reducer (rotary drive means) 23 is directly connected to the lower end of the ball screw shaft 20 without interposing a transmission mechanism such as a pulley or a belt. That is, the motor 23 with a speed reducer inputs the rotation of the electric motor 23a around the horizontal axis and the rotation of the electric motor 23a to the horizontal axis, and decelerates through a plurality of reduction gears including a bevel gear or a hypoid gear. The speed reducer 23b that outputs to the vertical axis S directed in the up and down direction is integrally assembled, the speed reducer 23b is attached to the lower end of the bearing housing 19, and the vertical axis S is the ball screw shaft 20 It is connected to the lower end.

  A pair of support shafts 24, 24 are fixed to the lower surface of the front plate 11 so as to be located on both sides of the ball screw shaft 20 and project downward. A support plate 25 is suspended from the lower ends of the support shafts 24, 24. On the upper end side of the support shafts 24, 24, a flat plate-like support member 26 is provided so as to move up and down by fitting a pair of shaft holes to the support shafts 24, 24, and the support plate 25. A pair of compression springs (springs) 27, 27 mounted on the respective support shafts 24, 24 are interposed between the support member 26 and the support member 26, and the support member 26 is always in contact with the urging force of the compression springs 27, 27. It is pressed against the lower surface of the front plate 11. The ball nut 22 is inserted into the center hole of the support member 26 through the cylindrical portion, and then fitted into the fitting hole 11a of the front plate 11, and fixed to the support member 26 with a bolt via the flange portion 22a. Has been. That is, the ball nut 22 is fixed to the front plate 11 so as to move up and down by a predetermined distance while being urged so as to be constantly pressed against the lower end of the front plate 11 by the compression springs 27 and 27. It is attached.

A pair of non-contact type limit switches 28a and 28b are shifted by a small distance in the length direction of the ball screw shaft 20 on one side (right side in FIG. 7) of the support plate 25. On the other hand, operating pieces 29a and 29b made of bolts are fixed to one side of the support member 26 so as to be adjustable in the length direction of the ball screw shaft 20, respectively.
The motor 23 with a speed reducer, the bearing box 19, the ball screw mechanism B2, the support shaft 24, the support plate 25, the support member 26, the compression spring 27, and the like raise and lower the injection device 7 along the guide rails 5 and 5. The injection nozzle elevating means 9 is configured to perform the nozzle touch operation by bringing the injection nozzle 8a of the heating cylinder 8 into contact with and separating from the movable mold (not shown) fixed to the movable platen 3. Yes.

Next, the operation of the electric vertical injection molding machine 1 configured as described above will be described.
At the start of the molding operation, etc., the injection device 7 is rotated in the state shown by the solid line in FIGS. 1, 6 and 7, and the ball screw shaft 20 is rotated by the rotation of the motor 23 with a speed reducer. The front plate 11 is lowered via a ball nut 22 screwed to the ball screw shaft 20, and the injection nozzle 8 a of the heating cylinder 8 is lowered to a position indicated by a chain line and attached to the movable platen 3. A nozzle touch operation is performed in contact with a movable mold (not shown).
In this nozzle touch operation, the front plate 11 of the injection device 7 is guided to the guide rails 5 and 5 with a firm support rigidity via the linear motion guides 6 and 6, and the ball The ball screw shaft 20 of the screw mechanism B2 has a center of gravity of the injection device 7 on a straight line L connecting the center Co between the pair of guide rails 5 and 5 and the center C1 of the heating cylinder 8 in plan view with respect to the axis C. Since it is disposed at or near the position, the front plate 11 can be lifted and lowered while the load applied to the front plate 11 of the injection device 7 is applied equally to the guide rails 5 and 5, thereby Combined with the solid support rigidity by the linear motion guides 6 and 6 for the rails 5 and 5, the heating cylinder 8 of the injection device 7 is smoothly prevented in a stable state by preventing its falling and shaking. To be able to lift the, abutment of the movable die of the injection nozzle 8a smoothly and accurately performed.

  After the injection nozzle 8a comes into contact with the movable mold, when the support member 26 is slightly lowered against the urging force of the compression springs 27, 27 via the ball nut 22, the upper portion of the support plate 25 is raised. It is detected that the limit switch 28a mounted in position is operated by the operating piece 29a of the support member 26, and the injection nozzle 8a is in contact with the movable mold. Further, the support member 26 further descends against the urging force of the compression springs 27, 27 from this position, so that the limit switch 28 b attached to the lower position of the support plate 25 is attached to the support plate member 26. It is detected that the injection nozzle 8a has come into contact with the movable mold by a predetermined pressure based on the urging force of the compression springs 27, 27. At this time, the motor 23 with speed reducer is operated. By stopping, the lowering of the front plate 11 is quickly stopped.

  When the nozzle touch operation is performed and the fixed mold and the movable mold are clamped between the movable platen 3 and the fixed platen by the mold clamping device 2, the screw rotation motor 18 is operated. The injection screw 12 is rotated via the pulleys 18a and 13b and the belt 18b, and is supplied into the heating cylinder 8 from a hopper (not shown) provided on the base end (upper end) side of the heating cylinder 8. The obtained resin material is melted and kneaded, and the molten resin is measured in the resin reservoir portion on the tip end side of the heating cylinder 8. At this time, the injection motor 17 is rotated and the ball screw shafts 15 and 15 are rotated via the pulleys 15a and 17a and the belt 17b, whereby the pusher plate 14 is lifted via the ball nuts 16 and 16. As a result, the injection screw 12 moves backward while applying a back pressure to the molten resin.

When the injection screw 12 moves back to the measurement completion position, the rotation of the screw rotation motor 18 is stopped, the rotation of the injection screw 12 is stopped, and the injection motor 17 is rotated in the opposite direction. The injection screw 12 is advanced through the pusher plate 14 and the molten resin measured in the heating cylinder 8 is injected into a mold cavity formed by a movable mold and a fixed mold, and molding is performed. .
At the time of metering and injecting the molten resin, the injection device 7 moves up and down smoothly as the pusher plate 11 is guided to the guide rails 5 and 5 through the linear motion guides 6 and 6 with a firm support rigidity. The ball screw mechanism B1 for moving the pusher plate 14 is operated without difficulty, and the axial movement of the injection screw 12 is performed smoothly and accurately.

  The ball nut 22 is attached to the front plate 11 so as to move up and down by a predetermined distance while being urged so as to be constantly pressed against the lower end of the front plate 11 by the compression springs 27, 27. The compression spring 27 provided between the front plate 11 (support plate 25) and the ball nut 22 (support member 26) effectively applies an impact at the time of nozzle touch where the injection nozzle 8a of the cylinder 8 contacts the movable mold. Can be buffered. Further, between the front plate 11 and the ball nut 22, a pair of limit switches 28a and 28b for detecting that the injection nozzle 8a of the heating cylinder 8 is in contact with the movable mold at a predetermined pressure are operated. Since the detection means including the pieces 29a and 29b is provided, the detection means can detect that the injection nozzle 8a has come into contact with the movable mold and stop the forward movement of the injection device quickly. In this way, it is possible to prevent the injection device 7 from coasting and to reliably prevent the injection nozzle 8a from coming into contact with the movable mold with excessive pressure, and to reduce the impact when the nozzle touches. it can.

  As described above, the electric vertical injection molding machine 1 according to the embodiment includes the front plate 11 having the heating cylinder 8 arranged in the vertical direction and the injection screw 12 inserted into the heating cylinder 8. A pusher plate 14 that rotatably supports the screw, a screw rotating motor 18 that rotates the injection screw 12 via a transmission mechanism including the pulleys 13b, 18a, and a belt 18b, and a pusher plate for the front plate 11 14 is movably connected in the axial direction of the injection screw 12, and the injection ball screw mechanism B1 is operated via a transmission mechanism including pulleys 15a, 17a and a belt 17b, and the pusher An injection device 7 having an injection motor 17 for moving the plate 14 relative to the front plate 11 is provided. The front plate 11 is supported by a pair of guide rails 5 and 5 erected on a movable plate 3 of a vertical mold clamping device via a linear motion guide 6 and 6 so as to be movable up and down. The injection device is moved up and down along the guide rails 5 and 5 by an injection device lifting / lowering means 9 having a ball screw mechanism B2 connected to the plate 11 and arranged in the vertical direction. Each axis of the ball screw mechanism B2 of the heating cylinder 8, the screw rotating motor 18, the injection motor 17 and the injection device lifting / lowering means 9 is provided so as to be brought into contact with and separated from the movable mold fixed to 3. The centers C1, C3, C2, and C are arranged on a straight line L passing through the center Co of the pair of guide rails 5 and 5 and orthogonal to a straight line Lo connecting the guide rails 5 and 5 in plan view, and the heating 8 and the axis C2 of the injection motor 17 is configured with configuration which is positioned opposite one another to between the axis C of the ball screw mechanism B2 of the injection apparatus lifting means 9.

  Therefore, according to the electric vertical injection molding machine 1 according to the above-described embodiment, the straight line Lo is located at the center Co of the pair of guide rails 5 and 5 and connects the guide rails 5 and 5 in a plan view. On the straight line Lo, the heating cylinder 8 and the injection motor 17 are placed opposite to each other with a weight balance between the ball screw mechanism B2 of the injection device lifting / lowering means 9, and the heating cylinder 8 is placed in a conventional manner. Since the injection motor 17 and the screw rotation motor 18 having a large weight difference from the center are not opposed to each other, a heating cylinder is used to balance the lightweight screw rotation motor 18 with the heavy injection motor 17. The screw rotating motor 18 and the injection motor 17 are not required to be installed at a position far away from the screw 8 or to add a balance weight to the screw rotating motor. It can be stored and installed in a small space, the weight of the apparatus can be reduced, and the moving body that moves together with the injection screw 12 at the time of injection and weighing operations can be reduced in weight so that the injection screw 12 can be made smooth. Movement and accurate position control are possible.

Further, since the injection device lifting / lowering means 9 can drive the injection device 7 in the vicinity of the center of gravity by the ball screw mechanism B2, it can be combined with the rigid support rigidity by the linear motion guides 6 and 6 with respect to the guide rails 5 and 5. In other words, when the nozzle touches, the injection device 7 can smoothly move up and down in a stable state without shaking, and the nozzle touch operation can be performed accurately.
Further, since the heating cylinder 8 and the linear motion guides 6 and 6 respectively guided by the two guide rails 5 and 5 are arranged at the apex position of the triangle on the front plate 11 in plan view, the nozzle It is possible to suitably prevent the injection device 7 from falling when touched.

Further, according to the electric vertical injection molding machine 1 according to the embodiment, the injection motor 17 is attached to the front plate 11 and the screw rotation motor 18 is attached to the pusher plate 14. Therefore, only the lightweight screw rotation motor 18 is attached to the pusher plate 14, and the heavy injection motor 17 is not attached, so that the pusher plate 14 moves together with the injection screw 12 during injection and weighing. The weight of the moving body can be reduced, and the smooth movement of the injection screw 12 and accurate position control can be performed more accurately.
However, the present invention is not limited to this, and the injection motor 17 may be attached to the pusher plate 14 and the screw rotation motor 18 may be attached to the front plate 11. In this case, the ball screw shafts 15 and 15 of the injection ball screw mechanism B1 are fixed to the front plate 11, and the ball nut 16.16 is rotatably supported by the pusher plate 14 and rotated by the injection motor 17. The ball nuts 16 and 16 are fixed to the front plate 11, and the ball screw shafts 15 and 15 are rotatably supported by the pusher plate 14 and rotated by the injection motor 17. In this case, the weight applied to the pusher plate 14 that moves together with the injection screw 12 is increased, and the structure of the injection device 7 is complicated.

  Further, according to the electric vertical injection molding machine 1 according to the embodiment, the pusher plate 14 is supported by the pair of guide rails 5 and 5 via the linear motion guides 6 and 6 so as to be movable up and down. Since it is configured, it can be guided and moved by the guide rails 5 and 5 through the linear motion guides 6 and 6, and the movement of the injection screw 12 in the axial direction can be performed more smoothly and accurately. be able to. Further, since the guide rails for supporting and guiding the pusher plate 14 can be shared with the guide rails 5 and 5 for supporting and guiding the front plate 11, the guide rails 5 and 5 for supporting and guiding the pusher plate 14 are used as the front rails. There is no need to stand on the plate 11, and the structure is simplified. However, the present invention is not limited to this, and a guide rail that exclusively supports and guides the pusher plate 14 is provided on the support columns 4, 4 independently of the guide rails 5, 5 or is erected on the front plate 11. You can also

  Furthermore, according to the electric vertical injection molding machine 1 according to the embodiment, the axis C of the ball screw mechanism B2 of the injection device lifting / lowering means 9 connects the pair of guide rails 5 and 5 in plan view. Since the configuration is arranged in the vicinity of the straight line Lo, the point of action of the force for moving the front plate 11 up and down by the ball screw mechanism B2 is positioned in the vicinity of the straight line Lo connecting the pair of guide rails 5 and 5. Therefore, it is possible to suppress the driving force of the front plate 11 by the ball screw mechanism B2 from acting as a force to tilt the front plate 11 against the guide rails 5 and 5 as much as possible. 11 can be raised and lowered more smoothly, and the life of the ball screw mechanism B2 can be extended by reducing abnormal wear and damage. That.

In the electric vertical injection molding machine 1 according to the embodiment, the ball nut 22 is attached to the front plate 11, and the ball screw shaft 20 is screwed into the ball nut 22 at its upper end. The lower end portion is supported on the movable plate 3 so as to be rotatable about the axis, and the motor 23 with a speed reducer is directly connected to the lower end of the ball screw shaft 20 to rotate the ball screw shaft 20. The ball nut 22 can be supported by the movable plate 3 and the screw shaft 20 can be attached to the front plate 11.
In addition, the pair of guide rails 5 and 5 is shown as being erected on the movable platen 3, but not limited thereto, machine parts such as a fixed platen and a machine frame supporting the fixed platen. Can also be set up in

It is the front view which showed the electric vertical injection molding machine which concerns on one embodiment of this invention in the partial cross section. FIG. FIG. 2 is a view taken in the direction of arrow B in FIG. 1. FIG. 2 is a cross-sectional view of FIG. FIG. 2 is a cross-sectional view of the knee of FIG. 1. FIG. 2 is a sectional view of the hoe of FIG. 1. FIG. 7 is a cross-sectional view taken along a partial cross section of FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric vertical injection molding machine 2 Clamping device 3 Movable platen 4 Prop 5 Guide rail 6 Linear motion guide 7 Injection device 8 Heating cylinder 8a Injection nozzle 9 Injection device raising / lowering means 10 Bracket 11 Front plate 12 Injection screw 14 Pusher plate 15 Ball screw shaft (ball screw shaft for injection)
16, 22 Ball nut 17 Electric servo motor for screw forward and backward advance (Injection motor)
18 Electric servo motor for screw rotation (Motor for screw rotation)
20 Ball screw shaft (ball screw shaft for nozzle touch)
B1 Ball screw mechanism (ball screw mechanism for injection)
B2 Ball screw mechanism (ball screw mechanism for nozzle touch)
C, Co, C1, C2, C3 center L straight line Lo straight line

Claims (4)

A front plate having a heating cylinder arranged in the vertical direction, a pusher plate that rotatably supports an injection screw inserted into the heating cylinder, a screw rotation motor that rotates the injection screw via a transmission mechanism, and An injection ball screw mechanism that connects the pusher plate to the front plate so as to be movable in the axial direction of the injection screw, and the injection ball screw mechanism is operated via a transmission mechanism so that the pusher plate is attached to the front plate. An injection device including an injection motor that moves relative to each other supports the front plate in a pair of guide rails so as to be movable up and down via a linear guide, and connects the movable plate and the front plate in the vertical direction. Ascending along the guide rail by the injection device lifting means having a ball screw mechanism arranged toward By abutting the injection nozzle of the heating cylinder to the movable platen which is fixed to the movable mold, a motorized vertical injection molding machine which is provided to space,
The shafts of the ball screw mechanism of the heating cylinder, screw rotation motor, injection motor, and injection device lifting / lowering means are straight and perpendicular to a straight line passing through the centers of the pair of guide rails in plan view. The electric scissors are arranged on a line, and the shafts of the heating cylinder and the injection motor are positioned opposite to each other with the axis of the ball screw mechanism of the injection device lifting / lowering means in between. Mold injection molding machine.   The electric vertical injection molding machine according to claim 1, wherein the injection motor is attached to the front plate, and the screw rotation motor is attached to the pusher plate.   The electric vertical injection molding machine according to claim 1 or 2, wherein the pusher plate is supported by the pair of guide rails through a linear guide so as to be movable up and down.   The electric motor according to any one of claims 1 to 3, wherein the axis of the ball screw mechanism of the injection device lifting / lowering means is disposed in the vicinity of a straight line connecting the pair of guide rails in plan view. Vertical injection molding machine.

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