JPH0660454U - Two-component paint mixing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a mixing device for mixing, for example, a two-pack type coating material comprising a main agent and a curing agent in a uniform mixed state. [Structure] Cylinder 11 divided into two by piston 3
The hardener supply hole 12 is opened toward the inside of the cylinder chamber 11a on one side of the chamber, the main agent supply hole 13 is opened toward the inside of the cylinder chamber 11b on the other side, and the mixed liquid is introduced into the cylinder chamber 11a at the one side. A discharge hole 14 is provided, a communication hole 15 for communicating both chambers is provided in the piston 3, and a check valve 16 is built therein. Then, the ball screw portion 4 is attached to the rod 4 of the piston 3.
A is provided and screwed into the screw receiving portion 8a of the ball screw receiving base 8 and is connected to the servo motor 5 on the slide table 7 so that the piston 3 can move forward and backward while rotating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mixing device for mixing, for example, a two-component paint composed of a main agent and a curing agent in a uniformly mixed state.

[0002]

[Prior art]

 Conventionally, as a device for mixing a two-component paint composed of a main agent and a curing agent, as shown in, for example, Japanese Patent Publication No. 2-33429, a fixed amount of each of the main agent and the curing agent is taken out by a metering pump and a static mixer Devices for mixing are known. By the way, in the case of such a mixing device, since a static mixer is used, the mixing ratio is likely to change, and the structure is complicated, which not only causes a cost increase, but also the flow path of the paint is lengthened. However, the present applicant has already proposed a paint mixing device such as Japanese Patent Application No. 4-293809, because of the problem that a large amount of cleaning liquid is required. In this device, the main agent is supplied to the chamber on one side of the cylinder chamber divided by the piston and the curing agent is supplied to the chamber on the other side, and the two liquids are mixed by the movement of the piston. For this reason, a communication passage that penetrates the piston in the front-rear direction is provided, and a check valve that opens when the piston moves to one side and shuts off when the piston moves to the other side is provided in this communication passage. There is. In other words, when the piston moves to one side, the liquid in the cylinder chamber on the moving side flows into the cylinder chamber on the other side through the communication passage, and both liquids are mixed.

[0003]

[Problems to be solved by the device]

 In the case of the above device, the mixing ratio of the main agent and the hardening agent can be arbitrarily changed by changing the position of the piston in advance, but for example, on the side opposite to the liquid in the cylinder chamber on the side where the piston moves. When the mixing ratio of the liquid in the cylinder chamber is 3: 7, the moving stroke of the piston is as short as 3/10. Therefore, even if a nozzle is installed at the tip of the communication passage, both liquids can be mixed evenly. However, there was a problem in that there was a limit.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention opens the A liquid supply hole toward one cylinder chamber in the cylinder chamber divided by the piston, and opens the B liquid supply hole toward the other cylinder chamber. In addition, the mixed liquid discharge hole was provided in the cylinder chamber on either side, the communication hole for communicating both chambers was provided in the piston, and the check valve was provided. Then, the piston was connected to the rotating mechanism.

[0005]

[Action]

 When the piston moves, the rotation mechanism rotates the piston around the piston axis, so that both liquids are uniformly mixed.

[0006]

【Example】

 An embodiment of the mixing device of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram of the entire apparatus, FIG. 2 is a front view of the piston, and FIG. 3 is a side view of the piston shown by breaking a portion of a communication hole.

As shown in FIG. 1, the two-liquid mixing device 1 includes a cylinder 2 attached to a fixed base, a piston 3 slidable in the cylinder 2, and a rod 4 extending from the piston 3. A servo motor 5 as a rotating mechanism connected to the extended end portion is provided, and the servo motor 5 is provided on a slide table 7 slidable along a linear guide 6. The linear guide 6 is provided parallel to the extending direction of the piston rod 4.

The rod 4 is provided with a ball screw portion 4 a in the middle of extending from the piston 3 slidably through the cylinder 2, and the ball screw portion 4 a of the ball screw receiving base 8 fixed to the fixing base. It is screwed into the screw receiving portion 8a.

The tip of the ball screw portion 4a is further extended, and the extended end portion 4b is connected to the output shaft 5a of the servomotor 5 via the speed reducer 10. Therefore, when the servo motor 5 is driven, the piston rod 4 rotates via the speed reducer 10, and the rod 4 screwed into the screw receiving portion 8a of the ball screw receiving base 8 moves forward or backward together with the servo motor 5. That is, the slide table 7 slides along the linear guide 6.

When adjusting the mixing ratio of the two liquids as described later, the original position of the piston 3 is changed by operating the servo motor 5 to move the slide table 7.

The piston 3 divides the space inside the cylinder chamber 11 into a front chamber 11 a and a rear chamber 11 b. (Note that FIG. 1 shows the state in which the piston 3 has moved to the rearmost end, and there is no volume of the rear chamber 11b.)

A hardener supply hole 12 for supplying a hardener, for example, is opened in the front chamber 11a, and communicates with the hardener supply portion via a valve mechanism (not shown), and at the rear. A main agent supply hole 13 for supplying the main agent or the cleaning liquid is opened in the chamber 11b, and communicates with the main agent supply unit and the cleaning liquid supply unit via a valve mechanism (not shown).

A mixed liquid discharge hole 14 for discharging the mixed two liquids is provided in the front of the chamber 11a and communicates with a coating gun (not shown).

The piston 3 is provided with a plurality of communication holes 15 which allow the front chamber 11a and the rear chamber 11b to communicate with each other.

That is, the communication hole 15 is configured as a through hole that penetrates the piston 3 along the piston axial direction, and as shown in FIGS. 2 and 3, at equal intervals along the circumferential direction of the concentric circles. A check valve 16 is provided inside each communication hole 15, and a nozzle 17 with a narrowed passage is provided on the side facing the front chamber 11a.

Further, the communication hole 15 has a different hole diameter in the middle with a step, and the check valve 16 has a ball 18 for opening and closing a passage at the step and a spring 19 for urging the ball 18. The spring 19 biases the ball 18 toward the rear chamber 11b.

A V packing 21 is attached to the outer peripheral surface of the piston 3, and the piston head is attached by a plurality of piston head attaching bolts 22 shown in FIG.

The operation of the mixing device configured as described above will be described.

First, the piston 3 is set at a desired position according to the mixing ratio of the main agent and the curing agent. That is, if the servomotor 5 is operated to move the piston 3 forward from the initial state of FIG. 1 and, for example, the main agent: hardening agent is set to 7: 3, the chamber internal volume 11b: Proceed to the position where 11a becomes 7: 3 to become the original position. Since this original position can be set to any position, the mixing ratio can also be set to any position.

Next, the curing agent is supplied from the curing agent supply hole 12 into the front chamber 11a, the main agent is supplied from the main agent supply hole 13 into the rear chamber 11b, and the respective chambers 11a and 11b are completely filled. To fill.

When the filling is completed, the hardening agent supply hole 12, the main agent supply hole 13, and the mixed solution discharge hole 14 are closed by a switching valve (not shown), and the servo motor 5 is operated to rotate the rod 4. At this time, the rotation direction of the rod 4 is the direction in which the piston 3 is retracted by the screw receiving portion 8a.

Therefore, the backward movement of the piston 3 increases the internal pressure of the rear chamber 11b, pushes the ball 18 of the communication hole 15 to open the check valve 16, and the main agent in the chamber 11b is injected from the nozzle 17 It is mixed with the curing agent in the chamber 11a.

Further, since the piston 3 retreats while rotating, the stirring effect is high and uniform mixing is performed. Then, when the piston 3 is fully retracted, the main agent and the curing agent are uniformly mixed at a ratio of 7: 3.

Next, when the switching valve of the mixed liquid discharge hole 14 is opened and the piston 3 is advanced, the ball 18 of the check valve 16 in the communication hole 15 blocks the passage due to the increase of the internal pressure in the chamber 11a. The mixed paint is discharged from the mixed liquid discharge hole 14.

At this time, at the time of changing colors or finishing coating, a cleaning liquid is supplied into the rear chamber 11b when the mixed paint is pushed out by the piston 3.

Then, the supply of the cleaning liquid is continued until the piston 3 is fully advanced, and when the piston 3 that has discharged the mixed coating material starts to move backward, the cleaning liquid filled in the rear chamber 11b is reversed from the communication hole 15. It sprays through the stop valve 16 to the front chamber 11a to clean the inside of both chambers 11a and 11b.

Then, this cleaning liquid is discharged from the mixed liquid discharge hole 14 by the forward movement of the piston 3 in the same manner as the above-mentioned procedure, and then air blow is performed.

By the way, FIGS. 4 and 5 show another embodiment in which the rotating mechanism is changed.

That is, in the mixing device 24 of FIG. 4, the worm gear 26 is provided on the output shaft of the servo motor 25 so as to mesh with the tooth portion 27 a formed on the piston rod 27. This is similar to the previous embodiment. Then, the piston 3 moves forward and backward while rotating by the operation of the servomotor 25.

The mixing device 28 shown in FIG. 5 is configured such that the rod 30 is rotated by a rack mechanism, and the rack 32 that moves up and down by an air cylinder 31 is meshed with the tooth portion 30 a of the rod 30. . Then, air is supplied to and discharged from the air cylinder 31 to move the piston 3 forward and backward while rotating. At this time, the original position of the piston 3 can be set to an arbitrary position by an air flow control valve (not shown).

The mixing device of the present application is not limited to the above-described embodiment, and for example, the piston 3 may be provided with fins or the like for enhancing the stirring effect.

[0032]

[Effect of device]

 As described above, in the two-component paint mixing device of the present invention, the mixing ratio of the two liquids can be set arbitrarily, and moreover, after the mixing is completed, it can be supplied to the coating gun. There are no problems such as scale. Further, the movement of the piston while rotating enhances the stirring effect of the two liquids, and the mixing can be made more uniform. And, especially when the amount of movement of the piston is small as a result of setting the mixing ratio of the two liquids, the technique of moving the piston while rotating it is effective in making the mixing more uniform.

[Brief description of drawings]

FIG. 1 is a block diagram of the entire apparatus

[Figure 2] Front view of the piston

FIG. 3 is a side view of the piston with the communication hole cut away.

FIG. 4 is a perspective view of another embodiment.

FIG. 5 is a perspective view of still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixing device 2 Cylinder 3 Piston 4 Rod 5 Servo motor 8a Screw receiving part 11 Cylinder chamber 12 Hardener supply hole 13 Main agent supply hole 14 Mixed liquid discharge hole 15 Communication hole 16 Check valve

Claims (1)

[Scope of utility model registration request] 1. A piston that divides a cylinder chamber into two, a liquid A supply hole that opens toward the one cylinder chamber divided into two, and a liquid B supply hole that opens toward the other cylinder chamber. A mixed liquid discharge hole that opens to the cylinder chamber on one side, a communication hole for communicating both chambers that penetrates the piston forward and backward, and a check valve provided in this communication hole are provided, and the piston is provided with a rotation mechanism. A two-component paint mixing device characterized by being connected.