JPH0129537Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solution measuring device used for automatic analysis of plating solutions and other surface treatment solutions, replenishment of chemical solutions, and the like.

Recently, with the development of functional plating, the importance of automatic management of plating solutions and the like has been strongly recognized. In functional plating, it is undesirable for the properties of the resulting plating film to change during plating or from plating to plating, and therefore the plating solution is controlled so as to always provide a plating film with constant properties. Therefore, it is necessary to detect the amount of components consumed in the plating solution by analyzing the plating solution, and to replenish the required amount to maintain the plating solution components at a constant concentration.

Conventionally, the first automated analysis method for plating solutions, etc.
It is known to use an automatic viewer as shown in the figure.

That is, numeral 1 in the figure is an automatic brewet, and the titration standard in the automatic brewet is introduced by introducing the titration standard solution into the automatic brewet 1 from the introduction tube 2 and raising the extrusion plate 4 by operating the pulse motor 3. Plating liquid 6 whose liquid is to be analyzed from outlet pipe 5
In this method, the titrant is placed in a titration cell 7 containing a certain amount of titrant, the end point of the titration is detected by electrodes 8, 8', and the amount of titrant is calculated from the number of pulses of the pulse motor 3 applied until the end point.

However, in the conventional automatic analysis method using an automatic brewet, there is a problem in the sealing between the inner wall of the column 1a from the automatic brewet 1 and the extrusion plate 4, and a defect in this sealing part 9 causes liquid leakage. If liquid enters this seal portion 9 and crystals may precipitate, sliding properties will deteriorate and liquid leakage will also become severe. For this reason, precision machining of the seal portion 9 is required, resulting in high cost. Further, drive valves 10 and 10' are respectively interposed in the inlet pipe 2 for introducing the titration standard solution into the automatic burette 1 and the outlet pipe 5 for leading out the titration standard solution from the inside of the automatic burette 1 to the titration cell 7.
Both use floating valves such as ball valves and poppet valves, but these floating valves have disadvantages such as failure, which can result in loss of airtightness, leakage, and measurement errors. Moreover, there is also a problem with durability, and therefore, there has been a strong desire for improvement.

The present invention was developed to improve the above-mentioned circumstances, and it has no fear of liquid leakage, can always reliably supply a fixed amount of solution, is easy to handle, has little risk of control operation errors, and has a structure. To provide a solution measuring device which is simple, can be produced at low cost, and has excellent durability.

That is, in order to achieve the above object, the present invention includes a measuring column, a solution supply pipe whose upper end opening is arranged above the inner bottom surface of the measuring column and communicates with the inside of the measuring column, and a solution supply pipe arranged inside the measuring column. a means for introducing the solution to the upper end opening of the solution supply tube or a lower side thereof, a measuring member, and a means for moving the measuring member up and down to move the measuring member into and out of the solution in the measuring column. By introducing the measuring member into the solution in the measuring column, the liquid level of the solution is raised from the upper end opening of the solution supply pipe, and this increase is transferred to the upper end opening of the solution supply pipe. By eliminating the sliding part and therefore the sealing part in this sliding part, as well as eliminating the floating valve, it is different from the conventional solution measuring device (automatic burette). This solves the shortcomings all at once. Furthermore, according to the present invention, the amount of solution discharged from the solution supply pipe (solution measurement amount) can be calculated simply by understanding the immersion volume of the measuring member in the solution, making it easy to adjust the measurement amount. It is completely independent of the size and shape of the weighing column, so
The size and shape of the weighing column can be freely designed according to the installation location, etc.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

11 in FIG. 2 is a cylindrical weighing column with a bottom,
One end of a solution supply pipe 12 and one end of a solution return pipe 13 are protruded from the sides of the column 11 and are opposed to each other. Reference numeral 14 denotes a solution storage tank, and one end of a solution introduction pipe 16 is immersed in the solution 15 contained in this storage tank 14, and the other end of this introduction pipe 16 is arranged at the upper part of the column 11. There is.

Furthermore, a cylindrical measuring member 17 is inserted into the column 11 along the axial direction of the column 11. The upper end of this measuring member 17 is fixed to the lower end of a drive shaft 18 whose upper part is formed as a rack part 18a, and the rack part 18a meshes with a pinion 20 fixed to the rotating shaft of a pulse motor 19. As a result, the drive shaft 18 is moved up and down along the axial direction of the column 11 by the operation of the pulse motor 19, and the measuring member 17 can be moved up and down together with the drive shaft 18.

In the figure, 21, 22, and 23 are valves, and 24 is a pump.

Next, to explain how to use the solution measuring device having the above configuration, first, close the valve 21, and then close the valve 21.
Operate the pump 24 with 2 and 23 open,
The solution 15 in the storage tank 14 is introduced into the metering column 11 through the introduction tube 16. When the solution 15 is introduced into the metering column 11 and its liquid level rises above the position where one end of the solution supply pipe 12 and the solution return pipe 13 are disposed, the solution 15 is returned to the storage tank 14 through the return pipe 13. At this stage, the operation of the pump 24 is stopped, and the valve 22 is closed when the liquid level of the solution 15 in the metering column 11 decreases and no longer flows out from the return pipe 13. In this state, weighing column 1
As shown in FIG. It is in.

Now open the valve 21 and use the pulse motor 19.
Activate. As a result, the pulse motor 19
The rotating shaft rotates, and the pinion 2 fixed to it rotates.
0 rotates together. Then, the drive shaft 18 having the rack part 18a meshed with the pinion 20 is lowered, and the measuring member 17 is lowered together with it and immersed in the solution 15 in the measuring column 11, and the measuring member 17 is lowered. The liquid level of the solution 15 rises by the volume immersed in the solution 15, and this rise flows out through the supply pipe 12 and is supplied to, for example, a titration cell.

Therefore, according to the embodiment described above, the measuring member 1
An amount of the solution 15 corresponding to the volume of the immersed portion with respect to the solution 15 of No. 7 is metered and supplied. That is, in this case, the measuring member 17 is cylindrical and its cross-sectional area is the same in any part in the axial direction.
The metering member 17 is lowered per revolution of the pulse motor 19 and is newly immersed in the solution 15.
is always the same, and the amount of solution flowing out from the supply pipe 12 per revolution of the pulse motor 19 is always the same. And this pulse motor 19
The amount of solution flowing out per revolution is the pulse motor 19.
Since it is specifically calculated from the amount of descent of the measuring member 17 per revolution and the size of the measuring member, the amount of outflowing solution can be calculated by counting the number of rotations or number of pulses of the pulse motor 19. be. Furthermore, by manipulating the pitch numbers of the rack portion 18a and the pinion 20, the amount of solution flowing out from the supply pipe 12 can be quantitatively controlled.

Thus, according to the embodiment of FIG.
The discharge amount (=metered amount) from the supply pipe 12 in No. 5 is equal to the volume of the measuring member 17 immersed in the solution 15, and the rise of the solution corresponding to this immersion volume is discharged from the supply pipe 12. Therefore, the discharge amount can be adjusted simply by adjusting the volume of the metering member 17 immersed in the solution 15, regardless of the size and shape of the metering column. In this case, there is no sliding or sealing part like in conventional automatic brewers, so there is no risk of liquid leakage due to seal failure, and a floating valve can be used. There is no need to worry about liquid leakage or malfunction, and it is easy to handle and has excellent durability. It can be effectively used as an automatic biuret for automatic analysis, a quantitative replenishment device for replenishing a surface treatment solution such as a plating solution, etc.

In the above embodiment, one end of the solution supply pipe 12 was connected to the side of the measuring column 11, but the arrangement of the supply pipe 12 is not limited to this, and for example, as shown in FIG. One end of the supply pipe 12 is passed through the side of the metering column 11 in a liquid-tight manner,
It is also possible to arrange the opening at one end facing upward. Further, in the above embodiment, the solution return pipe 13
was installed, but the return pipe 13 was not installed, and the solution 15
is introduced into the metering column 11 to a liquid level lower than the position at one end of the supply pipe 12, the metering member 17 begins to immerse into the solution 15, and the solution is measured using a liquid level sensor or other appropriate sensor. 15 is raised to the position at one end of the supply pipe 12, or the time when the solution begins to flow out of the supply pipe 12 is detected, and from this detection time the number of pulses of the pulse motor 19 is counted, or the measuring column 11 is The amount of the solution 15 introduced into the column is always kept constant, and the level of the solution 15 in the metering column 11 is always kept constant before the metering member 17 starts lowering. Various changes are possible, such as counting the number of pulses during the outflow time of the solution 15 from the number of pulses up to the start time of outflow of the solution 15. Furthermore,
The shape of the measuring member 17 is not limited to a cylindrical shape, but can be configured in any suitable shape. In this case, the measuring member 17 has a structure in which ring-shaped plate parts 17b are arranged at equal intervals along the axial direction on the shaft part 17a, as shown in FIG. 4, or as shown in FIG. The measuring member 17 may be formed into a desired shape depending on the purpose of use, such as a truncated conical shape so that as the measuring member 17 enters the solution 15, the amount of solution 15 supplied gradually decreases. There is no problem.

Further, in the above embodiment, one measuring member 17 is provided, but the present invention is not limited to this, and a plurality of measuring members 17 may be provided, and the upper end of the measuring column 11 is opened. It may be occluded or occluded.

Furthermore, a cushion material is disposed on the drive shaft 18, and the cushion material cushions the impact against the impact resistance of the measuring member, so that the above-mentioned functions and effects can be smoothly exerted. The mechanism for moving the measuring member 17 up and down is not limited to the illustrated embodiment, and other configurations may be modified in various ways without departing from the gist of the present invention.

As explained above, the present invention includes a measuring column, a solution supply pipe whose upper end opening is arranged above the inner bottom surface of the measuring column and communicates with the inside of the measuring column, and a A means for introducing the solution to the upper end opening of the solution supply pipe or a lower side thereof, a measuring member, and a means for moving the measuring member up and down to move the measuring member into and out of the solution in the measuring column. Then, by inserting the metering member into the solution in the metering column,
Since the liquid level of the solution is raised from the upper end opening of the solution supply pipe, and the increased amount is caused to flow out from the upper end opening of the solution supply pipe,
Regardless of the size and shape of the measuring column, by simply understanding and adjusting the amount of solution immersed in the measuring member, it is possible to always reliably feed a fixed amount of solution from the measuring column under control, and it is also easy to handle. It is simple and there is no risk of operational errors.Furthermore, since there is no need to seal both sides of the measuring member, there is no possibility of liquid leakage due to poor sealing, and the precision machining of the sealing part reduces costs. It has many advantages, such as eliminating the drawbacks, and since there is no floating valve, there is no leakage due to failure of the floating valve, it is extremely durable, and can be manufactured at low cost due to its simple structure. be.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an automatic analyzer using a conventional automatic brewet, Fig. 2 is a schematic sectional view showing one embodiment of the present invention, and Fig. 3 is a schematic sectional view showing another embodiment of the present invention. , FIG. 4, and FIG. 5 are sectional views showing other examples of the measuring member. 11...Measuring column, 12...Solution supply pipe, 1
7... Measuring member, 18a... Rack part, 19...
Pulse motor, 20...pinion.

Claims (1)

[Scope of utility model registration request] a measuring column; a solution supply pipe whose upper end opening is disposed above the inner bottom surface of the measuring column and communicating with the inside of the measuring column; comprising means for introducing the solution to the lower side, a metering member, and means for moving the metering member up and down to move the metering member into and out of the solution in the metering column,
By inserting the measuring member into the solution in the measuring column, the liquid level of the solution is raised from the upper end opening of the solution supply pipe, and the increased amount is caused to flow out from the upper end opening of the solution supply pipe. A solution measuring device characterized by comprising: