JP2008284811A - Mixing head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixing head high in injection accuracy, and simple in constitution even in a case of adding a third component. <P>SOLUTION: The mixing head includes: housings 11-13 each having a cylinder hole and an inner hole coaxial with the cylinder hole; a rotary cylinder 20 freely rotatably held in the housing 11 and having an inner circumferential surface being a continuous surface with the same diameter as that of the inner circumferential surface of the cylinder hole; a driving device 32 for rotating the rotary cylinder 20; a dispenser 16 for supplying a raw material to be mixed into the rotary cylinder; a piston 40 for sending out the mixture by executing a stroke from the cylinder hole to the inside of the inner hole of the rotary cylinder 20; and a piston driving device 42 for causing the piston 40 to execute the stroke. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mixing head, for example, a mixing head configured to mix two liquids such as a polyol component and an isocyanate component for molding a polyurethane foam product.

  As a mixing head for mixing an isocyanate component and a polyol component, there are a high-pressure mixing head and a low-pressure mixing head.

  The high-pressure mixing head is configured to circulate the raw material at a high pressure and to stir by discharging the raw material in a mist form from a nozzle into the mixing head (for example, Patent Document 1). The raw material in the head is pushed out by a cleaning rod so that no raw material remains in the head. In this high-pressure mixing head, a nozzle for discharging a polyol component and a nozzle for discharging an isocyanate component are necessary. In the case of discharging the third component, the third nozzle is necessary, and the mechanism and control become complicated and very expensive. In addition, the peripheral equipment becomes expensive due to high-pressure circulation of the raw material.

  The low-pressure mixing head discharges the raw material into the head at a low pressure, stirs it with an impeller in the mixing chamber, and causes the mixture to flow out by natural flow (for example, Patent Document 2). In this low-pressure mixing head, the inside of the head is cleaned by discharging air. However, since this is not perfect, the inside of the head needs to be cleaned with an organic solvent once every few rounds.

Further, in the low pressure mixing head, since the mixture flows out by natural flow, the injection accuracy may be lowered due to a housing loss or the like in which the mixture flows out gently from the nozzle.
JP-A-6-254843 JP 2000-94437 A

  An object of the present invention is to provide a mixing head that has high injection accuracy and is inexpensive.

  The mixing head according to claim 1 includes a head body having a holding hole, a rotating cylinder rotatably held in the holding hole, a driving device for rotating the rotating cylinder, and a raw material to be mixed. And a raw material supply unit for supplying the inside.

  A mixing head according to a second aspect of the present invention is the mixing head according to the first aspect, wherein the head body has a cylinder hole that is continuous with the holding hole and coaxial with the holding hole, and the inner surface of the rotary cylinder is the cylinder hole. The mixing head further includes a piston for stroking from the cylinder hole into the inner hole of the rotating cylinder to feed the mixture out of the rotating cylinder. And a piston driving means for causing the piston to stroke.

  According to a third aspect of the present invention, there is provided a mixing head according to the first or second aspect, comprising the one rotating cylinder.

  According to a fourth aspect of the present invention, there is provided the mixing head according to the first or second aspect, wherein a plurality of rotating cylinders are arranged coaxially, and adjacent rotating cylinders are configured to rotate in directions opposite to each other. It is.

  According to a fifth aspect of the present invention, there is provided a mixing head according to any one of the first to fourth aspects, wherein a cylindrical member is attached to the tip of the head body.

  In the mixing head of the present invention, the raw materials are supplied into the rotating cylinder and mixed. Accordingly, no facility for circulating the raw material at high pressure is required.

  In the mixing head according to one aspect of the present invention, the mixture mixed in the rotating cylinder is pushed out of the rotating cylinder by the piston that advances into the rotating cylinder, so that the mixture remains quickly and almost from the rotating cylinder. Since the entire amount can be discharged, the injection accuracy is good.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a sectional view of a mixing head according to an embodiment, FIG. 2 is a sectional view of a mixing head according to another embodiment, and FIG. 3 is a sectional view of a mixing head according to still another embodiment. is there.

  The mixing head of FIG. 1 includes a housing assembly 10 as a cylindrical head body, a rotating cylinder 20 rotatably held in the housing assembly 10, and a gear 30 for rotating the rotating cylinder 20. It is mainly composed of a piston 40 for extruding the mixture in the rotary cylinder 20.

  The housing assembly 10 includes a cylindrical first housing 11, a second housing 12, and a third housing 13 that are coaxially arranged and connected by bolts or the like. A rotary cylinder 20 is rotatably held by a bearing 21 in an inner hole (holding hole) of the first housing 11. An annular end ring 14 is fastened to the front end of the first housing 11 with a bolt 15, and a bearing 21 is interposed between the end ring 14 and the front end surface of the rotary cylinder 20.

  The second housing 12 is provided with a dispenser 16 so that the raw material is discharged into the housing 12 from the inner peripheral surface of the second housing 12 closest to the rotary cylinder 20. In this embodiment, two dispensers 16 are provided with overlapping positions in the circumferential direction. One is for polyol and the other is for isocyanate. The dispenser 16 is provided so as to spray the discharged liquid toward the inner peripheral surface on the opposite side.

  The inner hole of the rotating cylinder 20 and the inner holes of the second housing 12 and the third housing 13 have the same diameter, and the inner peripheral surface of the rotating cylinder 20 is continuous with the inner peripheral surfaces of the second housing 12 and the third housing 13. It is a surface.

  A rack 25 is provided on the outer peripheral surface of the rotary cylinder 20, and the gear 30 passes through the opening 17 of the first housing 11 and meshes with the rack 25.

  The gear 30 is connected to a drive device 32 such as an air motor via a gear shaft 31. The drive device 32 is supported by the third housing 13.

  A piston 40 is disposed in the inner diameter (cylinder hole) of the second housing 12 so as to be able to stroke into the rotary cylinder 20. The piston 40 is connected to a piston driving device 42 such as an air cylinder via a piston rod 41. The piston drive device 42 is supported by the third housing 13.

  In order to mix the urethane raw material using the mixing head configured as described above, the cylinder axis direction of the housing 10 is the vertical direction, the piston 40 is positioned in the second housing 12, and the rotating cylinder A polyol component and an isocyanate component are supplied from each dispenser 16 while 20 is rotated at a high speed, for example, several thousand rpm. The raw materials are mixed in the rotary cylinder 20 and flow out from the lower end of the housing 10. After supplying the required amount of raw material from the dispenser 16, the rotary cylinder 20 is stopped or decelerated, and then the piston 40 is lowered to push out the mixture in the rotary cylinder 20 from the lower end of the housing assembly. The piston 40 preferably extends into the lower end of the rotary cylinder 20 or into the end ring 16.

  Then, after raising the piston 40 into the second housing 12, the next raw material mixing is performed.

  According to this mixing head, a high-pressure nozzle is unnecessary, and even when the third component is added, it is only necessary to add the dispenser 16 and the configuration is simple. Further, since the piston 40 is used, almost no mixture remains in the rotating cylinder 20 and is quickly discharged, so that the injection accuracy is good. Also, since the rod is always accurate, cleaning is reliable. Moreover, since the inner peripheral surface is cylindrical, the raw material extends uniformly and thinly. In addition, if it is a polygon, it will come out by the centrifugal force. Since it is cylindrical, it is not necessary to control the rotation angle when lowering the rod.

  In the embodiment shown in FIG. 2, an end housing 19 is connected coaxially with the first housing 11 instead of the end ring 14 with respect to the lower end of the first housing 11 of the mixing head of the embodiment shown in FIG. . The end housing 19 is a cylindrical member having an inner hole having the same diameter as the inner hole of the rotary cylinder 20. In this embodiment, the piston 40 can be stroked to the lower end of the end housing 19.

  The mixing head shown in FIG. 2 is used in the same manner as the mixing head shown in FIG. The mixing head shown in FIG. 2 has the same effect as the mixing head shown in FIG. In the mixing head of FIG. 2, since the end housing 19 is used, the raw material that has moved while rotating in the same direction as the rotation along the inner peripheral surface of the rotary cylinder 20 is the inner peripheral surface of the end housing 19. When it flows down, the moving speed in the circumferential direction is reduced by friction with the inner peripheral surface of the housing 19. Therefore, the mixture flows down from the lower end of the end housing 19 without spreading so much in the radial direction. As a result, scattering of the mixture is suppressed.

  In the embodiment shown in FIG. 3, three rotating cylinders 20 </ b> A, 20 </ b> B, and 20 </ b> C are provided instead of the rotating cylinder 20. The rotary cylinders 20A, 20B, and 20C are rotatably held by cylindrical top housings 11A, 11B, and 11C, respectively. The lowermost rotary cylinder 20 </ b> A and the uppermost rotary cylinder 20 </ b> C are rotated in the forward direction by gears 30, 30 connected to the shaft 31. The middle rotary cylinder 20B is rotated in the reverse direction by the gear 30A connected to the shaft 31A. The shaft 31 </ b> A is interlocked with the shift 31 via an interlocking device such as a gear, and is configured to rotate in the opposite direction to the shaft 30.

  The piston 40 is stroked to the lower end of the lowermost rotary cylinder 20A. Other configurations of this embodiment are the same as those in FIG. In this embodiment, the same function and effect as the mixing head of FIG. 1 can be obtained. In this embodiment, since the middle rotary cylinder 20B rotates in the opposite direction to the upper and lower rotary cylinders 20C and 20A, the stirring ability is high.

  The above embodiment is an example of the present invention, and the present invention may take forms other than those shown in the drawings. For example, instead of the rotating cylinder driving method using gears, a rotating magnetic field generating means may be provided around the rotating cylinder so that the rotating cylinder is rotated by electromagnetic induction.

It is sectional drawing of the mixing head which concerns on embodiment. It is sectional drawing of the mixing head which concerns on another embodiment. It is sectional drawing of the mixing head which concerns on another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing assembly 11-13, 11A-11C, 19 Housing 20, 20A-20C Rotating cylinder 30, 30A Gear 40 Piston

Claims (5)

A head body having a holding hole;
A rotating cylinder rotatably held in the holding hole;
A driving device for rotating the rotating cylinder;
A raw material supply unit for supplying the raw material to be mixed into the rotary cylinder;
A mixing head equipped with In claim 1, the head body has a cylinder hole that is continuous with the holding hole and coaxial with the holding hole,
The rotating cylinder has an inner peripheral surface that is a continuous surface having the same diameter as the inner peripheral surface of the cylinder hole,
The mixing head further includes:
A piston for stroking from the cylinder hole into the inner hole of the rotating cylinder to feed the mixture out of the rotating cylinder;
Piston driving means for stroking the piston;
A mixing head characterized by comprising:   3. The mixing head according to claim 1 or 2, comprising one rotating cylinder.   3. The mixing head according to claim 1, wherein a plurality of rotating cylinders are arranged coaxially, and adjacent rotating cylinders are configured to rotate in directions opposite to each other.   5. The mixing head according to claim 1, wherein a cylindrical member is attached to a tip of the head main body.

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