JP3142417B2 - Stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid stirring device.

[0002]

2. Description of the Related Art Plating consists of a pre-treatment stage of plating, a plating treatment stage, and a post-treatment stage of plating. However, in practice, for example, copper plating (only the former stage) and nickel plating (all processes are required) For example, organic solvent degreasing-boiling degreasing-water washing-electrolytic degreasing-primary water washing-secondary water washing-copper strike-copper plating-recovery-primary water washing-secondary water washing-acid neutralization-primary water washing-secondary water washing It requires a number of steps of-nickel plating-recovery-primary water washing-secondary water washing-neutralization-water washing-hot water washing-drying. The greatest reason why such a large number of steps are required is that uniform contact between each processing solution and the object to be plated is not sufficiently performed. In general, stirring is important for achieving sufficient contact. A general stirring method of the plating solution is aeration using a blower as an air generation source, and a nickel method and a copper sulfate plating method are typical examples. In order to increase productivity over the conventional plating method with aeration, it is better to increase the current density.However, if the current density exceeds a certain level, burnt products due to overcurrent, kogation, and gas generation Pits and other defects increase, which is not realistic. However, in order to produce a good product sooner, it is important to increase the current density and at the same time agitate the plating solution. If the agitation is good, the agitation reduces the concentration difference between the liquid in the vicinity of the cathode and the anode, significantly improving the current efficiency, improving the productivity and improving the separation of gas such as hydrogen, thereby eliminating the occurrence of pits. Come. Disadvantages of aeration agitation include the current efficiency drop due to the air in the liquid, the sharpening of the brightener in the liquid, the deterioration of the liquid due to air oxidation, and the current density due to the unevenness of the air in the liquid. It becomes uniform and the variation in plating film thickness becomes large.Hydrogen gas and oxygen gas generated during electrolysis are incompletely removed, resulting in failure.Aeration agitation is required for blue baths, solder baths, etc. There are problems such as not being able to do it, the holes in the air pipe tend to be clogged, and it takes time to clean. Therefore, the present inventor has proposed a vibrating stirrer as an excellent stirrer instead of aeration (see Japanese Patent Application Laid-Open No. 3-275130). However, in the vibratory stirring according to the present invention, since the stirring blades are attached along the wall surface of the bathtub, there is a problem that the effective area of the bathtub is reduced and the throughput in one bathtub is reduced.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a new stirring means which does not reduce the effective area of a tank even if it is attached to an existing tank.

[0004]

SUMMARY OF THE INVENTION The present invention provides a tank for containing a fluid to be stirred, a vibration motor for generating vibration in the lateral direction, and an upper part of the tank for transmitting the vibration of the vibration motor in the lateral direction. A U-shaped vibration transmitter provided, a support member capable of receiving both ends of the U-shaped vibration transmitter via an elastic body, and a lower vibrator for the vibration of the U-shaped vibration transmitter A vertical vibration transmitter for transmitting the vibration to the fluid, a vibrator connected to the vertical transmitter and vibrating laterally at the bottom of the tank, and a vibration attached to the vibrator for transmitting the horizontal vibration of the vibrator to the fluid. A stirring device comprising blades, and a vibration motor installed on one side of the tank via a U-shaped vibration transmitter, an elastic body provided on the opposite side thereof, and a holding mechanism thereof, Is adjusted so that the weight is almost balanced between the two It relates stirrer according to claim Rukoto.

An outline of the apparatus of the present invention will be described with reference to the embodiment shown in FIGS. FIG. 1 shows a top view of the vibration stirrer of the present invention, and FIG. 2 shows a sectional view thereof. Reference numeral 1 denotes a vibration motor that generates vibration in a lateral direction, and 2 denotes a U-shaped vibration transmitter for transmitting the vibration, which is directly or via a slide bearing 13 to a tank or any support. It is attached (see FIG. 3). Numeral 3 is a support for preventing the vibration generated by the vibration motor 1 from being attenuated. Numeral 4 is for suspending the vibrator 5 having the vibrating blade 6 and vibrating the vibration of the U-shaped vibration transmitter. The vertical vibration transmitter serves to transmit the vibration to the child 5. The vibrating blade 6 has a function of imparting a vibrating stirring action to the liquid or powder in the tank by the vibration of the vibration motor 1. Elastic bodies 8, 8 such as springs are provided on both sides of the support body 3 (see FIG. 3) to prevent the vibration of the U-shaped vibration transmitter 2 from being attenuated and to the side of the vibration motor 1. The weight generated by useless vibration is minimized by making the weight approximately the same as the weight of the.
Through the U-shaped vibration transmitter, the weight of the vibration motor installed on one side of the tank and the elastic body provided on the opposite side thereof and the holding mechanism thereof are almost balanced. It is preferable that it is adjusted as follows.

The vibrator of the present invention may be in a rod state or a frame. In short, it is sufficient to transmit the lateral vibration transmitted from the transmitter at the bottom of the tank to the vibrating blade.

An arbitrary number of vibrating blades may be attached to the vibrator. The vibrating blade is mounted vertically or obliquely on the vibrator (see FIGS. 5A to 5D). The vibrating blade can be attached to the vibrator by welding or can be detached. In particular, it is preferable to employ a method in which the blades are attached to the vibrator in a push-in manner, because the size of the vibrating blades and the number of the vibrating blades can be changed according to the required stirring conditions. Further, it is also possible to change the mounting angle of the blade. The size of the tank is width 8
In the case of 00 mm, length 1000 mm, and depth 1100 mm, for example, a width of 80 mm and a length of 500 at intervals of 50 mm.
By attaching a vibrating blade having a thickness of 0.15 mm and a thickness of 0.15 mm, a sufficient stirring effect can be obtained.

[0008] The presence of the support which receives the two ends of the U-shaped vibration transmitter via the elastic body is to prevent the lateral vibration generated by the vibration motor from being attenuated. It is preferred to have a similarly robust structure. For example, it is possible to use an H-shaped steel material or a reinforcing steel bar, a concrete wall containing a steel frame, or the like, which is formed by laying a foundation on the ground and standing vertically on the foundation. When the vessel wall is sufficiently firm, the vessel wall can be used as a support.

The elastic body serves to receive the vibration of the vibration transmitter and repel the vibration from the support, and preferably has a strong spring force. For example,
As shown in FIG. 3, a spring in which a spring 8 having a diameter of 3 to 10 mm made of spring steel is fitted around a round bar 7 can be used as the elastic body. It is preferable that the elastic body is installed in contrast to the vibration motor side of the support and the opposite side. 3 has such a structure, and the spring is fixed by a holding mechanism, for example, a stopper plate 9.

The stirring apparatus of the present invention is useful for stirring liquid, stirring powder, stirring liquid and powder, and the like. For example, in the plating step, the present invention can be used as a stirring device for each tank such as a degreasing tank, a washing tank, a washing tank, and a plating tank. In these cases, the agitating device of the present invention may be further provided with aeration means. Further, the stirring device of the present invention is useful as a stirring device for a reaction or a mixing device for mixing various components such as chemicals, medicines, agricultural chemicals, and fertilizers. Further, the present invention is also useful as a stirring device for mixing powders, granules, and the like, and for mixing these solids and liquids.

[0011]

【Example】

Example 1 A vibration stirrer is assembled as shown in FIG. 6 using a SUS301 stainless steel degreasing tank. As shown in FIG. 6, a vibration frame corresponding to the vibrator 5 is provided at the bottom of the degreasing tank at 1000 ×.
The assembly is assembled with a size of 800 mm, and columns corresponding to the vertical vibration transmitter 4 having a height of 1100 mm are set up at six places of the vibration frame, and connected to the U-shaped vibration transmitter 2 provided at the upper part of the degreasing tank. Vibration frame is 500mm long at 50mm intervals,
The vibrating blade 6 having a width of 80 mm and a thickness of 0.15 mm is attached. The vibration motor 1 used was 0.4 kw,
Vibrate at 27 Hz. The drive circuit of the vibration motor used an inverter. Japan Techno Co., Ltd.
10% of brand name Technoclean # 2000 (alkaline surfactant; pH 11.3, specific gravity 1.04 / 20 ° C)
Add an aqueous solution and add a positive center electrode (diameter 5m)
m, length 15 mm, hole diameter 3 mm) many were put in a barrel, hung in a degreasing tank, washed by vibration stirring at 70 ° C. for 5 minutes, then transferred to a water washing tank shown in FIG. . The washing tank shown in FIG. 1 was the same as that shown in FIG. 5, except that the electric heater 10 was not provided. The results are shown in the following table.

[Table 1]

Example 2 A small stainless steel plate of a machine part contaminated with oil was put in a barrel, and a vibratory stirrer for degreasing used in Example 1 (FIG. 6)
Washed using. The degreasing tank contains petroleum-based naphthenes as the main component.
700 (specific gravity 0.815 / 15 ° C, flash point 86 ° C, BP
209.5 ° C., EP 235.5 ° C.)
The mixture was vibrated at 5 Hz for 5 minutes, and hot-air dried for 3 minutes without washing with water. The residual oil content was 3.
What was 10 g / piece was reduced to 0.15 mg / piece.

Example 3 A vibration stirrer for plating shown in FIG. 7 was used. The apparatus of FIG. 7 differs from the apparatus of the first embodiment only in that an electrode 11 is provided instead of the heater 10 in the apparatus of the first embodiment of FIG. 6, but all other conditions are the same as those of the apparatus of the first embodiment. Copper sulfate 215 g / l Sulfuric acid 53 g / l Brightener A small amount A small amount of chloride ion A copper sulfate plating solution consisting of 50 ml / l was used, and copper plating was performed on the printed circuit board together with ordinary aeration. Aeration was adjusted so that aeration was uniform.
The air discharge hole of the stirring pipe was opened at 45 ° toward the tank bottom, and the distance between the hole and the plated component was 200 mm. An oilless low pressure blower with an air filter was used to prevent oil mist from being mixed into the stirring air. Vibration stirring of Example 3: 29.4 Hz Current density: 6 A / dm ² Plating time: 30 minutes Control (only aeration) Current temperature: 3 A / dm ² Plating time: 60 minutes In the case of only aeration (control), the current temperature However, in the case of Example 3, the current density could be twice that of the control, and as a result, the plating time was reduced by half. Further, FIG. 8 shows two samples randomly processed from a large number of processed substrates, and the plating film thicknesses thereof were measured at each display position of the substrates, and the measured values are shown in FIG. In FIG. 8, (a) and (b) show the results of the vibration agitation process, (c) and (d) show the results of the process using only the aeration, and the sizes are 340 μm in width and 17 m in height, respectively.
0μ. It can be seen that the variation of the film thickness of Example 3 is smaller than that of the control.

Example 4 Using the same vibrating stirrer for plating as in Example 3, 50 m
A flat and uneven machine part of mx 40 mm was subjected to nickel plating using the following nickel plating bath. Nickel sulfate 105 g / l Nickel chloride 60 g / l Boric acid 45 g / l Ferrous sulfate 10 g / l Organic complexing agent 25 g / l Brightener 20 g / l PH 3.2 Bath temperature 63 ° C. Current density 8 A / dm ² invention No boric acid was precipitated at all in the vibrating stirrer described above, but in the case of the aeration method (conventional method), boric acid was deposited on the aeration nozzle and aeration was impossible. In the conventional method, only a current density of 3 to 4 A / dm ² was obtained.

[0015]

【effect】

(1) The current density could be increased without deteriorating the quality of the product. (2) The current efficiency is improved when aeration is not used or when aeration is reduced. (3) With only vibration agitation, no bubbles are generated in the liquid, so that the current density is uniform and the variation in film thickness is small. (4) When there are various gases generated by the reaction in the stirrer, these gases are quickly out of the system due to vibration.
Inconvenience due to the presence of gas can be significantly reduced. (5) An extremely effective stirring effect is exhibited in a bluing bath plating, a solder bath, or the like to which aeration is originally not compatible. (6) Even when aeration is used in combination, the degree can be reduced, so that component loss due to oxidation and volatilization due to aeration can be reduced. (7) The luster of the plated product is much better than the conventional product.

[Brief description of the drawings]

FIG. 1 is a top view of a basic vibration stirrer of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is an enlarged sectional view of a portion A in FIG. 2;

FIG. 4 is a schematic diagram of a vibration transmission mechanism and a vibrator.

FIGS. 5A to 5D show various modes of attaching the vibrating blade to the vibrator. FIGS.

FIG. 6 is a top view of a vibration stirrer for degreasing.

FIG. 7 is a top view of a vibration stirrer for plating.

FIG. 8 shows measured values of the plating film thickness at each of the display locations of the printed circuit board processed in Example 3, wherein (a) and (b) show two sheets subjected to the vibration stirring process according to the present invention. (C) and (d) are data of two substrates that have been subjected to only the aeration process according to the control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration motor 2 U-shaped vibration transmitter 3 Support 4 Vertical vibration transmitter 5 Vibrator 6 Vibrating blade 7 Round bar 8 Spring 9 Stop plate 10 Heater 11 Electrode 12 Tank 13 Slide bearing

Claims (2)

(57) [Claims] 1. A tank for storing a fluid to be stirred, a vibration motor for generating vibration in a lateral direction, and a U-shape provided on an upper portion of the tank for transmitting vibration of the vibration motor in a lateral direction. Vibration transmitter, support that can receive both ends of U-shaped vibration transmitter through elastic body, vertical vibration transmission to transmit vibration of U-shaped vibration transmitter to lower vibrator A vibrator connected to the vibrator, a vertical transmitter, and vibrating in the lateral direction at the bottom of the tank, and a vibrating blade attached to the vibrator for transmitting the lateral vibration of the vibrator to the fluid; And a vibration motor installed on one side of the tank via a U-shaped vibration transmitter, and an elastic body provided on the opposite side thereof and a holding mechanism therefor. A stirrer characterized by being adjusted to be almost balanced Place. 2. The apparatus according to claim 1, further comprising aeration means.
A stirrer as described.