JP4965208B2 - Two-component mixing device - Google Patents

Description

  The present invention relates to a two-component mixing apparatus for mixing two components of a two-component mixed curable resin.

Patent Document 1 discloses a two-component mixing apparatus that mixes two components with relatively high viscosity such as a two-component adhesive and paint. This two-component mixing apparatus forms a two-component mixing chamber by connecting a first introduction passage and a second introduction passage through which different first and second liquids are introduced, and the lower end of the mixing chamber is connected to a funnel. A mixing shaft for mixing two liquids is rotatably inserted into the mixing chamber, and a scraping plate that rotates near the inner surface of the funnel-shaped portion of the mixing chamber at the lower end of the mixing shaft. Separately from this scraping plate, a scraping pin projects at the lower end of the mixing shaft in parallel with the axis of the mixing shaft, and this scraping pin projects to the tip of the nozzle formed at the lower end of the funnel-shaped part It is characterized by that. The scraped plate and scraping focus can quickly scrape the hardened material generated from the liquid mixture, so that the nozzle is clogged and the liquid cannot be discharged to the outside, and the mixing shaft is difficult to rotate. It is said that smooth discharge of the mixed liquid can be maintained without causing inconvenience such as.
JP 2002-263532 A

  However, the above method is effective when mixing two liquids with relatively high viscosity. However, if the mixing ratio difference between the two liquids is large and the viscosity difference is large and the curing start time is extremely short, A cured product was generated in the liquid retention part, and it was not always satisfactory.

  The present invention is an improved invention of the above-described two-component mixing apparatus made to solve such a problem. The mixing ratio difference between the two components to be mixed is large, the viscosity difference is large, and the curing start time is extremely short. Even if it is a case, it aims at providing the two-component mixing apparatus which can maintain required mixing performance stably for a long time.

The two-liquid mixing apparatus of the present invention includes a liquid introduction part having a first introduction path for introducing the first liquid and a second introduction path for introducing the second liquid, and is connected to the liquid introduction part. A mixing means for mixing the second liquid, the mixing means comprising a hollow case having a nozzle for discharging the mixed liquid at the tip, and a mixing shaft rotatably disposed in the hollow. an apparatus, hollow bottom of the case is reduced in diameter in a tapered shape toward the nozzle, and the conical surface slidable contact with the hollow bottom to the tip of the mixing shaft, toward the conical top of the conical bottom in this conical surface The groove is formed, and the pin is disposed at the tip of the conical surface and is eccentric to the axis of the mixing shaft and slidably contacts the inner peripheral surface of the nozzle. is, the pin is projected to the tip of the nozzle from the groove portion, a distal end portion of the mixing shaft to the hollow bottom sliding Characterized by rotating the mixing shaft by.

  In the two-component mixing apparatus of the present invention, the tip end portion of the mixing shaft and the hollow bottom portion are formed so as to be in sliding contact with each other, and a groove portion extending to the tip end side along the conical surface is formed at the tip end portion of the mixing shaft. Therefore, all of the mixed liquid mixed by rotating the mixing shaft flows through the groove portion and is discharged from the nozzle and does not stay in the mixing chamber. Therefore, a cured product is not generated in the mixing chamber, and the nozzle is not clogged, the mixing shaft is fixed, and the operation is not hindered.

The width of the groove in the circumferential direction of the mixing shaft, Ru constant der in discharge direction of the liquid mixture. Since the width of the groove does not change in the longitudinal direction, which is the discharge direction of the mixed liquid, the mixed liquid can be circulated smoothly. The discharge direction of the mixed liquid is a direction in which the mixed liquid is discharged to the outside from a nozzle provided at the lower end of the mixing unit.
Further, in the two-component mixing apparatus of the present invention, the tip of the mixing shaft is provided with a pin that is eccentric to the axial center of the mixing shaft and slidably contacts the inner peripheral surface of the nozzle. It is provided up to the tip of the nozzle. By providing such a pin, the smooth discharge of the mixed liquid from the nozzle can be maintained for a long time.

  In the two-component mixing apparatus of the present invention, the mixing unit may include an on-off valve mechanism that controls the flow of the first liquid or the second liquid into the mixing unit. By providing this on-off valve mechanism, it is possible to prevent the flow of either the first liquid or the second liquid into the mixing means as necessary. Curing of the liquid can be suppressed.

  In the two-component mixing apparatus of the present invention, the mixing means may be provided with a cooling means for cooling the vicinity of the tip of the mixing means. By providing the cooling means, it is possible to suppress heat generation caused by mixing the two liquids. When the two liquids generate heat by mixing, the reaction is accelerated by the temperature rise, and the curing proceeds rapidly. By cooling the two liquids in a mixed state with a cooling liquid, the progress of the reaction can be moderated even with a liquid mixture having a very short curing start time.

  Since the two-component mixing apparatus of the present invention is configured as described above, nozzle clogging and member malfunction do not occur even with an adhesive having a short curing start time after two-component mixing. Therefore, since the bonding work that has been conventionally performed off-line can be incorporated into a line for flowing one piece, productivity can be greatly improved.

  An embodiment of the present invention is shown in FIG. FIG. 1A is a cross-sectional view of a two-component mixing apparatus, and FIG. 1B is a front view of a mixing shaft viewed from the tip side.

  The two-component mixing apparatus 1 includes an introduction unit 2 that introduces a first liquid and a second liquid, and a mixing unit 3 that mixes the introduced first liquid and the second liquid. Then, the first liquid and the second liquid introduced from the respective storage tanks (not shown) to the introduction part 2 are mixed by the mixing means 3 connected to the introduction part 2, and the mixed liquid mixture is provided at the lower end of the mixing means 3. Then, the liquid mixture can be discharged from the nozzle 4 to the outside and applied to a predetermined portion of the adherend.

  The introduction part 2 is formed with a first introduction path 5 for introducing the first liquid and a second introduction path 6 for introducing the second liquid, and each liquid is passed through an appropriate control valve (not shown). Can be introduced from each reservoir (not shown). Further, by connecting the introduction part 2 to the mixing means 3 described later, the first introduction path 5 and the second introduction path 6 are connected to a first passage 51 and a second passage 61 that open to the mixing chamber 11 (described later). It comes to communicate with.

  The mixing means 3 includes a hollow case portion 7 and a mixing shaft portion 8 that is rotatably fitted in the hollow portion. The case portion 7 includes a upper body 9 having a first passage 51 and a second passage 61 and connected to the introduction portion 2, and a lower body 10 having a nozzle 4. The upper body 9 and the lower body 10 of the case portion 7 are connected on the same axis, and the hollow portion forms a two-liquid mixing chamber 11. Further, the bottom 12 of the mixing chamber 11 is formed in a taper shape with a diameter decreasing in the nozzle 4 direction.

  The mixing shaft portion 8 includes a mixing shaft 13 fitted in the mixing chamber 11 and a rotating shaft 14 that is connected to driving means such as a motor (not shown) and rotates the mixing shaft 13. The mixing shaft 13 protrudes from the outer periphery of the mixing protrusion 15 at an appropriate interval, and its tip is formed in a conical shape so as to be slidable in contact with the bottom 12 of the mixing chamber 11 formed in a tapered shape. Further, a groove 16 having a constant width is formed at the tip of the conical surface from the cone bottom toward the cone top. Further, a pin 17 is provided at the tip portion so as to be parallel to the shaft center of the mixing shaft 13 and eccentric from the shaft center so as to protrude to the tip of the nozzle 4. The pin 17 is rotated while being in sliding contact with the inner peripheral surface of the nozzle 4 by the rotation of the mixing shaft 13.

In addition, the upper body 9 of the case portion 7 is provided with an on-off valve mechanism 18 that controls opening and closing of the second passage 61 connected to the second introduction path 6. The on-off valve mechanism 18 includes a valve rod 19, a piston 20 connected to the valve rod 19, and a cylinder 21 that houses the piston 20 and is driven to move forward and backward. The valve rod 19 faces the second passage 61, and can enter the second passage 61 to prevent the second liquid from flowing into the mixing chamber 11. In this on-off valve mechanism 18 , the valve rod 19 normally moves into the second passage 61 to prevent the second liquid from flowing. Then, when performing the mixing operation, it moves backward to allow the second liquid to flow into the mixing chamber 11.

  In addition, a ring member 22 is attached so as to accommodate the lower body 10 of the case portion 7, and a cooling means 24 is configured in which a cooling chamber 23 is formed between the ring member 22 and the outer peripheral surface of the lower body 10. By allowing a coolant such as water to flow through the cooling chamber 23, heat generation caused by the mixing of the two liquids can be suppressed, and the progress of the reaction can be moderated even with a liquid mixture having a very short curing start time. it can.

  The two-liquid mixing apparatus 1 configured as described above can effectively mix the first liquid and the second liquid, and can maintain stable discharge of the mixed liquid.

  First, the control valve (not shown) on the first introduction path 5 and the second introduction path 6 side is opened to introduce the first liquid and the second liquid into each introduction path, and the valve rod 19 is moved backward. The second passage 61 is opened. As a result, the first liquid flows from the first connection port 52 into the mixing chamber 11 via the first passage 51 from the first introduction path 5. The second liquid flows into the mixing chamber 11 from the second connection port 62 via the second introduction path 6 and the second passage 61. Next, the mixing shaft 13 is rotated to stir and mix the first liquid and the second liquid in the mixing chamber 11. And this liquid mixture is discharged | emitted from the nozzle 4 and made to adhere to a target object.

  Here, since the mixing protrusion 15 provided on the outer periphery of the mixing shaft 13 is spirally arranged at a predetermined distance, the introduced first liquid and second liquid are repeatedly divided and merged. Efficient mixing due to rotational shear effect. Moreover, since the mixing protrusion 15 is helically arranged along a spiral opposite to the rotation direction of the mixing shaft 13 (for example, if the rotation direction is a right rotation, the spiral is a left-hand screw), the first The mixed liquid in which the liquid and the second liquid are mixed can be effectively discharged from the nozzle 4.

  The two-component mixing apparatus 1 is formed so that the mixing projection 15 and the conical surface at the tip of the mixing shaft 13 are in sliding contact with the inner peripheral surface and the bottom surface 12 of the mixing chamber 11. Grooves 16 are formed on the surface. For this reason, the two liquids introduced into the mixing chamber 11 are mixed by the mixing protrusion 15 arranged spirally as described above, circulate through the groove 16, and are discharged from the nozzle 4. That is, the mixed liquid does not stay in the mixing chamber 11 while the mixing shaft 13 is rotating. Therefore, even if the adhesive has a remarkably short curing time, a cured product is not generated, and problems such as nozzle clogging, member fixing, or malfunction are not generated. In the two-component mixing apparatus 1 of the present embodiment, the gap between the conical surface of the mixing shaft 16 and the tapered surface of the bottom surface of the mixing chamber 11 is 0.1 mm or less.

  Further, a pin 19 is provided at the tip of the mixing shaft 16 so as to be eccentric in parallel with the axis. The pin 19 is rotated so as to be in sliding contact with the inner peripheral surface of the nozzle 4 by the rotation of the mixing shaft 16. For this reason, hardened | cured material does not adhere and deposit also on the internal peripheral surface of the nozzle 4, and smooth discharge of a liquid mixture can be maintained.

  As described above, the two-component mixing apparatus 1 of the present embodiment includes the cooling means 24 that cools the vicinity of the tip of the case portion 7. Therefore, it is possible to suppress heat generation caused by mixing the two liquids. When the two liquids generate heat by mixing, the temperature of the liquid mixture rises, the reaction is accelerated, and curing proceeds rapidly. However, by cooling the two liquids in a mixed state with a refrigerant such as water, the reaction can be delayed, and the generation of a cured product can be suppressed and the liquid mixture can be discharged smoothly.

  In addition, when the two-component mixing apparatus 1 of this embodiment is incorporated in a line and an adhesive is applied to an object to be bonded in synchronization with other work, the line stops for a short time in relation to the other work. (Hereinafter referred to as “chocolate stop”). When such a chocolate stop occurs, the second connection port 62 is closed by the valve rod 19 using the on-off valve mechanism 18 to prevent the second liquid from flowing into the mixing chamber 11. After the second connection port 62 is closed, only the first liquid is introduced into the mixing chamber 11 and the two-liquid mixture remaining in the mixing chamber 11 is reliably discharged from the nozzle 4 to the outside and mixed. The chamber 11 is filled with only the first liquid. Since only the first liquid does not cure even when the mixing operation is stopped, the nozzle 4 is not clogged and the members such as the mixing shaft 13 are not stuck during the operation stop, and the two liquids are also retained after the restart. The mixing device 1 can be used smoothly.

  Moreover, when disassembling the two-component mixing apparatus 1 for cleaning and repair, an operation of completely discharging the liquid in the two-component mixing apparatus 1 is performed. In this operation, first, the second connection port 62 is closed with the valve rod 19 by using the on-off valve mechanism 18 to prevent the second liquid from flowing into the mixing chamber. And it introduce | transduces by introduce | transducing a solvent and water in the mixing means 3 from the 1st introduction path 5, and wash | cleaning an inside, or introducing pressurized air. At this time, if a two-component cured product is adhered in the mixing means 3, a large amount of solvent and time are required for the dissolving operation. However, in this embodiment, the mixed liquid does not stay in the mixing chamber 11 and the hardening of the mixed liquid is effectively prevented by the cooling means or the like, so that the mixing means 3 can be easily cleaned. Is possible. Therefore, the labor and cost of work can be greatly reduced.

  The two-component mixing apparatus of the present invention is not limited to the above-described embodiment, and may be changed without departing from the gist of the present invention. For example, in the cooling means, an uneven portion for heat dissipation may be formed on the outer peripheral surface of the case portion 7 accommodated in the ring 22. By forming the concavo-convex portion, the cooling effect of the mixing chamber 11 can be further enhanced. In the embodiment, the number of grooves at the tip of the mixing shaft is one, but a plurality of grooves may be used for improving fluidity. Thus, by increasing the passage area of the mixed liquid, the pressure loss at the time of discharge can be reduced and a stable coating operation can be maintained.

  The two-component mixing device of the present invention is suitable as a two-component mixing device such as a room temperature curing adhesive or sealant having a large mixing ratio difference between two components to be mixed and a large viscosity difference and extremely short curing start time. Can be used. In this case, it is desirable to use the first liquid as a main agent and the second liquid as a curing agent. In addition, in a line where the bonding operation or the sealing operation is performed in synchronization with other operations, the two-component mixing apparatus of the present invention has a significant effect and contributes to an improvement in productivity.

It is a figure explaining an Example. (A) is sectional drawing, (b) is the front view which looked at the mixing shaft 13 from the front end side.

Explanation of symbols

2: Liquid introduction part
3: Mixing means
4: Nozzle
5: First introduction path
6: Second introduction path
7: Case part
8: Mixing shaft
11: Mixing chamber
12: Hollow bottom
13: Mixing shaft
15: Mixing protrusion
16: Groove
17: Pin
18: Open / close valve mechanism
19: Valve stem
23: Cooling chamber
24: Cooling means

Claims (3)

A liquid introduction part having a first introduction path for introducing the first liquid and a second introduction path for introducing the second liquid;
A mixing means for connecting the liquid introduction section and mixing the first liquid and the second liquid;
The mixing means is a two-component mixing apparatus comprising a hollow case having a nozzle for discharging the mixed liquid at the tip, and a mixing shaft rotatably disposed in the hollow,
Hollow bottom of the case is reduced in diameter in a tapered shape toward the nozzle,
And slidable contact conical surface on the hollow bottom to the tip of the mixing shaft, a groove portion formed toward the conical top of the conical bottom circular conical surface, disposed at the distal end portion of the circular conical surface of the mixing shaft A pin that is eccentric to the shaft center and slidably contacts the inner peripheral surface of the nozzle,
The groove is formed with a constant width in the circumferential direction of the mixing shaft, and the pin protrudes from the groove to the tip of the nozzle,
Two-liquid mixing device, characterized by rotating the mixing shaft by sliding contact with the front end portion of the mixing shaft to the hollow bottom.   The two-component mixing apparatus according to claim 1, wherein the mixing unit includes an on-off valve mechanism that controls an inflow of the first liquid or the second liquid into the mixing unit.   The two-component mixing apparatus according to claim 1, wherein the mixing unit includes a cooling unit that cools the vicinity of the tip of the mixing unit.

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