JP2010036552A - Method for replacing heating barrel with inserted screw of electric injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for changing cartridge system heating barrel, regarding a screw and a heating barrel as one set, in which a heating barrel with an inserted screw is dismounted from an injection unit to be replaced with another heating barrel with an inserted screw. <P>SOLUTION: In the method of changing the heating barrel with the inserted screw of an electric injection molding machine which executes advancement of the screw at injection by the rotation of a ball screw provided behind the screw, a U-groove, which the heating barrel can pass through from the surface of a fixing plate in the axis direction of the barrel, is provided on the fixing plate which is cantilevered with the heating barrel, and a block is provided which fits to the U-groove and presses the heating barrel against the bottom surface of the U-groove. In order to change the heating barrel with the inserted screw, the block fitted to the U-groove is dismounted and then the heating barrel is taken out along the U-groove. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for replacing a heating barrel with a screw of an electric injection molding machine inserted.

    The injection unit of the injection molding machine of the conventional electric injection molding machine will be described with reference to FIGS. 6 and 7. The injection unit 1 has the heat generated by the heating device provided with the material resin 3 introduced from the hopper 2 in the heating barrel 4. After the heat is melted by the shearing heat generated by the rotation of the screw 6 mounted in the heating barrel 4 by the measuring motor 5, the molten resin is measured at the tip of the screw 6 and then the sliding base 7 on which the injection unit 1 is mounted is nozzle-touched. The ball screw 9 is rotated forward by the ball motor 9 (leftward in the figure), the nozzle at the tip of the heating barrel 4 is touched to the mold 10 in the mold clamping device, and the ball screw 12 is rotated by the injection motor 11. The screw 6 that is screwed into this is moved forward, the above-mentioned measured molten resin is injected, cooled and cured, and then taken out as a molded product.

The screw 6 inserted into the heating barrel 4 so as to be freely rotatable and retreatable is used as a material resin used in the previous molding remaining in the heating barrel 4 when changing the color or changing the material corresponding to the molded product. In order to remove this effectively, the screw 6 is pulled out of the heating barrel 4 and cleaned.
The drawing of the screw 6 from the heating barrel 4 has a mold clamping device on the drawing side of the screw 6 and a drawing space cannot be secured. Therefore, as shown in FIG. 6, the injection unit 1 is swung as shown by a chain line 1a. Avoiding fastening devices is being done.
Japanese Patent Laid-Open No. 2003-340867 JP 2003-39482 A

  However, the conventional method for pulling out the screw needs to swivel the sliding base on which the injection unit is mounted, and the swivel device has a complicated configuration and is expensive to manufacture. In addition, the injection unit is heavy, and the swiveling work and subsequent screw pulling work are troublesome and take time.

  To do this, remove the heating barrel with the screw inserted from the injection unit, and replace the heating barrel with another screw inserted into a cartridge system with a pair of screw and heating barrel. The conclusion of the swiveling work and the subsequent screw drawing work is not necessary, the work is simple and takes a short time, and the conventional drawbacks are eliminated, and the present invention has been reached.

  In order to achieve the above-mentioned object, the present invention relates to a heating barrel replacement method in which a screw of an electric injection molding machine in which the screw of an electric injection molding machine is inserted by rotating a ball screw provided at the rear of the screw is inserted. A U-shaped groove with a width that allows the heating barrel to pass through from the surface to the barrel axis direction is provided on the fixed plate that cantilever-supports, and a block that fits into the U-shaped groove and presses the heating barrel to the bottom of the U-shaped groove When replacing the heating barrel with the screw inserted, after removing the block fitted in the U-shaped groove, the heating barrel is taken out along the U-shaped groove while the screw is inserted. The heating barrel replacement method was used.

Further, it is most suitable if the heating barrel is replaced while the screw is inserted, characterized in that the surface of the fixed plate is the upper surface of the fixed plate.

  Further, it is preferable to replace the heating barrel with the screw inserted into the fixed plate, the surface of which is the side of the fixed plate.

  According to the present invention, it is not necessary to turn the heavy injection unit, and it is not necessary to pull out the screw, so that the disadvantages of the conventional screw pulling out operation are eliminated.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4 by taking as an example an electric injection molding machine that performs injection by rotating two ball screws.
The injection unit 20 includes a fixed plate 24 in which a screw 21 is rotatably inserted and movably inserted by a predetermined distance, and a heating barrel 22 having a nozzle 23 attached to the tip is fixed in a cantilever state. The rear plate 25 provided at the rear portion is connected by a tie bar 26, and a movable plate 27 is provided between the plates 24 and 25. The movable plate 27 is fixed so that the rear end portion of the screw 21 can be rotated in a cantilevered state. In addition, it is guided by the tie bar 26 at the time of injection and weighing, and is moved forward and backward by a predetermined distance.

A transmission shaft 28 which is rotatable but does not move in the axial direction is attached to the movable plate 27, the rear end portion of the screw 21 is inserted into the through hole of the transmission shaft 28, and the rotation of the measuring motor 30 is timed by the key 29. This is transmitted to the screw 21 via the belt 31 and the pulley 32.
As shown in FIGS. 3 and 4, a split collar 33 and a presser plate 34 are attached to the front end surface and the rear end surface of the transmission shaft 28 with screws 35 and 36, respectively, to prevent the screw 21 from coming off.

  Two ball screws 37 are fixed to symmetrical positions deviating from the extension of the screw rear end of the surface A facing the rear plate 25 of the movable plate 27, respectively, from the injection motor (not shown) on the rear plate 25. The rotating plate 27 is rotated only by a timing belt (not shown) and a pulley 38 and screwed into a nut 39 fixed in the axial direction. When the nut 39 rotates during injection and measurement, the movable plate 27 moves back and forth (left and right in the figure). The screw 21 that moves and is fixed to the movable plate 27 via the nut 39 advances and retreats within the heating barrel 22 by a predetermined distance.

  As shown in FIG. 2, a U-shaped groove having a slightly wider width than the diameter of the heating barrel 22 and a bottom surface slightly larger than the diameter of the heating barrel 22 is provided from the upper surface of the fixing plate 24. At the time of attachment to the fixing plate 24, the block 40 is fitted into the U-shaped groove, and the heating barrel 22 is pressed from above and fixed by the bolt 41, and heated by the split collar 42 and the screw 43 on the front surface B of the fixing plate 24. The axial movement of the barrel 22 is stopped.

  As described above, when replacing the heating barrel with the screw inserted, the nozzle 21 at the tip of the heating barrel 22 is retracted from the nozzle touch state by a nozzle touch device (not shown) while the screw 21 is in the forward limit state. Then, as shown in FIG. 5, the split collar 33 and the presser plate 34 indicated by chain lines are removed, the key 29 is removed, and the movable plate 27 is moved backward from the forward limit to the backward limit, whereby the screw 21 is inserted into the heating barrel 22. In this state, the movable plate 27 is released.

  Next, when the split collar 42 and the screw 43 that stop the axial movement of the heating barrel 22 on the front surface B of the movable plate 27 are removed, the bolt 41 is removed, and the block 40 is removed from the U-shaped groove, the heating barrel 22 is removed. Is released from the movable plate 27 and can be lifted upward (arrow a) by a crane or the like as indicated by a chain line 22a, and can be exchanged for a heating barrel into which another screw is inserted.

  As described above, the example in which the U-shaped groove of the movable plate 27 is provided from the upper surface of the movable plate 27 has been described. However, the present invention is not limited to this, and it is also possible to provide the U-shaped groove from the side surface of the movable plate 27. is there.

  In the above description, the electric injection molding machine performs injection by rotating two ball screws. However, the present invention is not limited to this, and injection is performed by rotating one ball screw as shown in FIG. An electric injection molding machine may be used.

  A single ball screw electric injection molding machine shown in FIG. 6 will be described. The injection unit 50 is inserted therein so that a screw 51 is rotatable and movable by a predetermined distance, and a nozzle 53 is provided at the tip. A fixed plate 54 to which the attached heating barrel 52 is fixed in a cantilever state and a rear plate 55 provided at the rear of the injection unit 50 are connected by a tie bar 56, and a movable plate 57 is connected between the plates 54 and 55. The movable plate 57 is rotatably fixed to the rear end portion of the screw 51 in a cantilever state, and is guided by the tie bar 56 at the time of injection and weighing to move a predetermined distance back and forth.

A transmission shaft 58 that is rotatable but does not move in the axial direction is attached to the movable plate 57, the rear end portion of the screw 51 is inserted into the transmission shaft 58, and the timing belt 61 rotates the measuring motor 60 with the key 59. And it is transmitted to the screw 51 via the pulley 62.
The split collar 63 inserted in the groove of the screw 51 is attached to the front end surface of the transmission shaft 58 with a screw (not shown) as described in the above-described embodiment to prevent the separation.

  A ball screw 64 is provided on the screw shaft extension line on the rear end surface of the transmission shaft 58, and is a nut that is rotated only by a timing belt 66 and a pulley 67 from an injection motor 65 provided on the rear plate 55 and fixed in the axial direction. When the nut 68 is rotated during injection and metering while being screwed into the screw 68, the movable plate 57 moves back and forth (left and right in the figure), and the screw 51 fixed to the movable plate 57 via the transmission shaft 58 is heated. Advancing and retreating a predetermined distance.

  As shown in FIG. 7, a U-shaped groove having a width slightly larger than the diameter of the heating barrel 52 and a bottom surface slightly larger than the diameter of the heating barrel 52 is provided from the upper surface of the fixed plate 54. At the time of attachment to the fixing plate 54, the block 69 is fitted into the U-shaped groove, and the heating barrel 52 is pressed from above and fixed by the bolt 70, and provided on the outer peripheral surface of the heating barrel 52 on the front surface of the fixing plate 54. A split collar 71 is inserted into the groove and attached to the front surface of the fixed plate 54 with a screw 72 to stop the axial movement of the heating barrel 52.

  As described above, when replacing the heating barrel with the screw inserted, the nozzle 53 at the tip of the heating barrel 52 is moved from the nozzle touch state by a nozzle touch device (not shown) while the screw 51 is in the forward limit state. When the split collar 63 that fixes the screw 51 to the front end surface of the transmission shaft 58 is removed, the key 59 is removed, and the movable plate 57 is moved backward from the forward limit to the backward limit, the screw 51 moves to the heating barrel 52. It is released from the movable plate 57 while being inserted.

  Next, when the split collar 72 on the front surface of the fixed plate 54 that stops the axial movement of the heating barrel 52 is removed, the bolt 70 is removed, and the block 69 is removed from the U-shaped groove, the heating barrel 52 is removed from the movable plate 57. It is released and can be lifted up by a crane or the like as described above, and can be replaced with a heating barrel into which another screw is inserted.

  Since it is configured in this way and has a cartridge system in which a screw and a heating barrel are combined, it is possible to replace the heating barrel with a screw inserted without performing a troublesome and time-consuming screw pulling operation. .

It is explanatory drawing which shows one Embodiment of the electric injection molding machine using two ball screws with which this invention is applied, and shows the advance limit of a screw. FIG. 2 is a cross-sectional view taken along the line CC in FIG. 1, showing an embodiment of an electric injection molding machine using two ball screws to which the present invention is applied. FIG. 2 is an enlarged DD cross-sectional view of FIG. 1 showing an embodiment of an electric injection molding machine using two ball screws to which the present invention is applied. FIG. 2 shows an embodiment to which the present invention is applied and is an enlarged Z arrow view of FIG. It is explanatory drawing made into the state which can take out the heating barrel which the movable plate moved backward and the screw was inserted out of the body (injection unit). It is explanatory drawing which shows other embodiment to which this invention is applied, and shows the advance limit of the screw of the electric injection molding machine using one ball screw. The other embodiment to which this invention is applied is shown and is an explanatory view of an electric injection molding machine using one ball screw, and is a part of the EE cross-sectional view of FIG. It is the front view explaining the outline | summary of the conventional electric injection molding machine. It is explanatory drawing which shows a part of top view explaining the outline | summary of the conventional electric injection molding machine.

Explanation of symbols

20, 50 Injection unit 21, 51 Screw 22, 52 Heating barrel 23, 53 Nozzle 24, 54 Fixed plate 25, 55 Rear plate 26, 56 Tie bar 27, 57 Movable plate 28, 58 Transmission shaft 29, 59 Key 30, 60 Weighing Motor 31, 61, 66 Timing belt 32, 38, 62, 67 Pulley 33, 42, 63, 71 Split collar 34 Presser plate 35, 36, 43, 72 Screw 37, 64 Ball screw 39, 68 Nut 40, 69 Block 41 , 70 Volt 65 Injection motor

Claims (3)

  In the method of replacing the heating barrel with the screw of the electric injection molding machine in which the screw of the electric injection molding machine is inserted by rotating the ball screw provided at the back of the screw during the injection, the fixing plate supporting the heating barrel cantilevered from the surface A heating barrel with a U-shaped groove that can pass through the heating barrel in the barrel axis direction, a block that fits into the U-shaped groove, and that presses the heating barrel on the bottom of the U-shaped groove, with the screw inserted A method of replacing a heating barrel with a screw inserted, wherein the heating barrel is taken out along the U-shaped groove after removing the block fitted in the U-shaped groove when replacing the screw.   2. The method of replacing a heating barrel with a screw inserted therein according to claim 1, wherein the surface of the fixing plate is an upper surface of the fixing plate. 2. The method of replacing a heating barrel with a screw inserted therein according to claim 1, wherein the surface of the fixing plate is a side surface of the fixing plate.

Images