JP5634970B2 - Color changing device by rotating valve sleeve of resin molding machine - Google Patents

Description

  The present invention relates to a color changing device by rotating a valve sleeve of a resin molding machine that easily eliminates a staying molten resin when changing the color of a molding resin raw material.

  In general, in a hot runner molding process using a molten resin as a raw material in various resin molding machines, the color or raw material of the molded product may be changed in the middle.

  In this case, since the previous molten resin remains in the flow path of the molten resin in the mold, the residual resin must be removed by causing a new raw material to flow out on a trial basis (see, for example, Patent Document 1). ).

JP 2003-127178 A

  When opening and closing the gate using a valve pin that penetrates the manifold of the resin molding machine, a large amount of residual material stays on the opposite side of the front surface where the resin flow passage of the valve pin contacts, that is, the rear surface side, and it is easily removed. There was a problem that I could not.

  That is, the flow resin where the molten resin flow passage intersects the valve pin is divided into two by the valve pin and merges on the back side of the valve pin, but the flow velocity tends to drop and stay at the merge point. In the case of color change, there is a problem that the resin before color change remaining in the staying portion is pulled out little by little and the color cannot be changed easily.

  The present invention has been made paying attention to the above points, and attempts to replace the residual resin in the staying portion by changing the position of the staying portion of the resin confluence portion of the valve pin by the rotation of the sleeve piece arranged on the valve pin. The present invention provides a color changing device by rotating a valve sleeve of a resin molding machine that can be removed with a new resin.

  The present invention has the following technical configuration in order to solve the above problems.

  (1) A horizontal molten resin flow passage provided in the manifold, and a vertical flow passage communicating with the flow passage, passing through the horizontal flow passage and passing through the vertical flow passage. A valve pin to be installed vertically is provided, and the molten resin can be injected from the lateral flow passage of the manifold through the vertical flow passage to the cavity through the gate and inserted into the flow passage of the manifold of the valve pin. A tubular resin flow changing sleeve piece is provided, an inclined surface is provided at a position facing the manifold flow path at the end of the sleeve piece, and a valve pin is attached to the sleeve piece when changing the color of the molten resin. It is provided so as to be rotatable at the center so that the flow direction of the molten resin can be changed so that the old resin in the resin retaining portion on the outflow side of the molten resin behind the valve pin can be removed. Color changing device according to the valve sleeve rotates in a resin molding machine according to claim.

  (2) The tubular resin flow changing sleeve piece is configured to be able to be rotated and biased around the valve pin by a driving means provided in the mold. Color change device by rotating valve sleeve.

  (3) The resin molding machine according to (2), wherein the drive means includes a meshing portion at a tip of a rotary shaft having a knob and meshes with a meshing portion of a tubular resin flow changing sleeve piece. Color change device by rotating valve sleeve.

  According to the present invention, the tubular resin flow changing sleeve piece is rotated in the process in which the old resin stays in the resin remaining portion formed in the rear of the resin flow of the valve pin vertically mounted in the manifold. To make the slanted surface of the sleeve piece different from the flow direction of the old resin by making a dynamic bias, to form a new flow direction of the resin, and to wash away the resin of the old resin retention part formed behind the valve pin Therefore, it is possible to perform quick color-changing resin molding by reducing the tempering molding effect by the color-changing resin.

  The sleeve piece for resin change can be rotated with a tool such as a spanner, but it can be easily remotely controlled from the outside of the mold using a gear configuration to make an efficient new resin for effective color change. Exchange work can be performed.

Overall configuration diagram of color changing apparatus according to the present invention The expanded sectional view of the principal part which shows the mounting state of the sleeve piece for resin flow change which is the principal part structure of FIG. It is a figure which shows the relationship between the inclined surface of the sleeve piece for resin flow change of FIG. 2, and the flow path of resin, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view. It shows the operating state of the sleeve piece for resin flow change in FIG. 3, (a) is a longitudinal sectional view, (b) is a transverse sectional view Explanatory sectional view showing an example of driving means according to the present invention

  An embodiment of the present invention will be described below with reference to the drawings.

  1 is a mold of a resin molding machine, 2 is a manifold through which molten resin flows, 3 is a flow path of molten resin, 4 is a flow path of molten resin communicating with the manifold 2, and is orthogonal to the flow path 3 of molten resin Provided. Reference numeral 5 denotes a valve pin. A piston 6 is provided at the base end. The piston 6 is disposed in a cylinder 7 provided in the mold 1 and reciprocates in the cylinder 7 with a working fluid such as atmospheric pressure or hydraulic pressure. The valve pin 5 reciprocates in conjunction with the molten resin flow passages 3 and 4. Reference numeral 8 denotes a gate that leads to the cavity, and is opened and closed by the tip 9 of the valve pin 5.

  Reference numeral 10 denotes a tubular resin flow changing sleeve piece inserted into the valve pin 5, and an inclined surface 11 is formed at the tip, facing the molten resin flow passage 4 of the manifold 2, and the molten resin flowing through the flow passage 4. It works to change the distribution direction W. And the resin retention part X is formed in the back of the valve pin 5 which faces the flow path 4 of molten resin.

  Reference numeral 12 denotes a driving means for rotating the resin flow changing sleeve piece 10. A tool such as a spanner is applied to the resin flow changing sleeve piece 10 simply by removing a gap or a part of the mold 1. (Not shown) is used to lock or grip the head of the resin flow changing sleeve piece 10 and rotate it to a desired angle to change the position of the inclined surface 11 to the resin retaining portion X of the valve pin 5. The distribution state of the molten resin can be changed. The inclined surface 11 can be formed in a desired shape such as a tapered shape or an arc shape, and can smoothly guide the resin flow.

  The operation will be described based on the above configuration.

  After the resin molding process with the first resin, when molding with a new resin, that is, a new resin whose color has been changed, the old resin remaining in the molten resin flow paths 3 and 4 of the mold 1 is renewed. The color changing resin is subjected to a trial cutting process.

  At that time, the tubular resin flow changing sleeve piece 10 inserted through the valve pin 5 for quickly removing the residual resin in the resin retaining portion X is rotationally displaced.

  Due to this displacement, the inclined surface 11 at the tip of the resin flow changing sleeve piece 10 opposes in a state different from the flow direction W of the molten resin. A new resin invades and pushes out the remaining old resin. Since the old resin residue is a small number, the residual resin content can be removed cleanly by scoring molding.

  Then, when the resin is completely converted to a new resin, the resin flow changing sleeve piece 10 is rotated to the current state by using a tool such as the spanner described above, and then the repetitive resin molding process using the new resin is performed. Can do.

  Next, an example of the driving means 12 of the resin flow changing sleeve piece 10 will be described with reference to FIG.

  Reference numeral 13 denotes a passive meshing portion provided at the top of the resin flow changing sleeve piece 10, and 14 denotes a driving meshing portion meshing with the meshing portion 13, which has a bevel gear structure. Reference numeral 15 denotes a shaft rod of the meshing portion 14, which is inserted into the mold 1 so as to be pivotally supported and protrudes out of the mold 1 to fix the knob 16.

  Therefore, if the knob 16 is grasped with the fingertip and rotated in either the left or right direction, the rotating action of the meshing portion 14 of the bevel gear rotates the resin flow changing sleeve piece 10 by meshing with the meshing portion 13. it can.

  After completion of trimming for color change, the knob 16 is rotated in the opposite direction to return to the original state, whereby a molding operation with a new resin can be performed.

  In addition, although an example of the drive unit 12 has been shown, various other and preferred drive units can be employed.

DESCRIPTION OF SYMBOLS 1 Mold 2 Manifold 3, 4 Flow path 5 Valve pin 6 Piston 7 Cylinder 8 Gate 9 Tip part 10 Resin flow change sleeve piece 11 Inclined surface 12 Drive means 13,14 Engagement part 15 Shaft 16 Pick X Resin retention part W Flow direction of molten resin

Claims (3)

  A horizontal molten resin flow passage provided in the manifold, and a vertical flow passage communicating with the flow passage, pass through the horizontal flow passage and are vertically installed in the vertical flow passage. A valve pin is provided so that the molten resin can be injected from the lateral flow passage of the manifold through the vertical flow passage into the cavity through the gate and is inserted into the flow passage of the valve pin manifold. A flow-changing sleeve piece is provided, an inclined surface is provided at a position facing the manifold flow passage at the end of the sleeve piece, and the sleeve piece is rotated around the valve pin when the color of the molten resin is changed. It is possible to change the flow direction of the molten resin so as to be able to remove the old resin in the resin retaining portion on the outflow side of the molten resin behind the valve pin. Color changing device according to the valve sleeve rotates in a resin molding machine according to.   2. The tubular resin flow changing sleeve piece is configured such that it can be rotated and biased about a valve pin by a driving means provided in a mold. Color change device.   3. The valve sleeve rotation of a resin molding machine according to claim 2, wherein the driving means is provided with a meshing portion at a tip of a rotary shaft having a knob and meshed with a meshing portion of a tubular resin flow changing sleeve piece. By color change device.

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