JPH0716994Y2 - PH measuring device for containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a PH measuring apparatus suitable for measuring the PH of a liquid in a container such as a reaction tank or a stirring tank in a chemical plant or the like.

<Prior Art> Conventionally, in containers such as reaction tanks and agitation tanks in chemical plants and the like, PH is measured for PH adjustment, confirmation of reaction state, and the like.

In this case, the PH sensor (PH electrode) is manually inserted into the container to measure the PH.

<Problems to be Solved by the Invention> However, such a conventional PH measurement structure has the following problems.

That is, the PH sensor is generally made of glass, and there is a situation in which it is extremely easily damaged.

Therefore, when an operator manually inserts the PH sensor into the container as described above, extra care must be taken to prevent damage to the PH sensor. If the container is made of glass lining, in the worst case, the container may be damaged.

On the other hand, when PH influences the process, more precise measurement is required, but it is not preferable to immerse the PH sensor in the liquid during operation from the following points.

That is, since the liquid is agitated in the agitation container, the accuracy of the PH sensor is likely to be deteriorated, damaged, or damaged due to the influence of the liquid agitation.

Therefore, in consideration of the conventional problems described above, the present invention provides a PH
A PH measuring device for containers that prevents damage to the PH sensor and enables precise measurement by automating the insertion and removal of the sensor into the container and by performing protection and verification when the PH sensor is taken out. The purpose is to provide.

<Means for Solving the Problem> Therefore, in the PH measuring device for a container of the present invention, the position where the PH sensor is inserted into the container through the opening formed in the container and the position where the PH sensor is taken out of the container are provided. A moving means for reciprocatingly supporting the PH sensor in a reciprocating manner, and a liquid holding container containing a liquid for protecting or assaying the PH sensor by immersing the tip detection part of the PH sensor, Support means for the liquid holding container that pivotally supports the sensor by moving it between the position of the movement path of the sensor and a position deviated from the position of the movement path. -Shaped lower support plate attached to the other end of the tubular member that is attached to the container so that the end portion and one end communicate with each other, and the PH sensor can be inserted, and a vertically upper position of a predetermined distance from the lower support plate. , Relative to the lower support plate And a pair of screw shafts connecting the upper support plate and the lower support plate, wherein one end is rotatably supported by the upper support plate and the other end is A pair of screw shafts rotatably supported on the lower support plate, and a pair of nuts provided on each screw shaft,
Balls for rolling bearings are placed in a row in a coiled space formed by facing the screw groove on the outer peripheral surface of the screw shaft and the screw groove on the inner peripheral surface of the nut. A ball screw set having a structure in which the nut is returned to the thread groove at the other end of the nut through the hole of the nut, and the pair of nuts slides along the screw shaft by rotation of the pair of screw shafts. The PH sensor is a slide plate that is fixedly attached to the pair of nuts and moves integrally with the nuts, and is arranged along a vertical line passing through a horizontal line connecting the pair of screw shafts in the horizontal direction. A slide plate to which an upper end portion of is fixedly attached, and a rotating means for rotating the pair of screw shafts.

Further, the tubular member attached to the opening of the container is provided with a ball valve through which a PH sensor can be inserted when the valve is opened,
It was configured so that the opening could be closed when the PH sensor was taken out of the container.

<Operation> In such a configuration, the PH sensor at the uppermost position is lowered when measuring the pH of the liquid in the container.

That is, when the ball valve is provided, it is opened and the liquid holding container is rotated and moved to a position deviated from the movement path position of the PH sensor.

Then, the moving means is driven to the PH sensor lower side to lower the PH sensor.

In this case, the rotating means in the moving means is driven to the PH sensor descending side to rotate both screw shafts. As a result, the pair of nuts slides downward, and the PH sensor is lowered.

The tip portion of this PH sensor is inserted into the container from the opening of the container via a ball valve or the like, and is projected into the liquid in the container.

When the measurement of PH is completed, when the moving means is driven to the PH sensor rising side this time, the PH sensor is lifted and is again set to the first uppermost position.

In this case, the rotating means in the moving means is driven to the PH sensor rising side to rotate both screw shafts. As a result, the pair of nuts slide upward and the PH sensor is raised.

After that, close the ball valve and open the liquid holding container.
Rotate and move to the movement path position of the PH sensor.

Next, the moving means is driven to the PH sensor descending side, the PH sensor is descended, the tip detection part of the PH sensor is dipped in the liquid in the liquid holding container, and stands by for the next PH measurement.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

In addition, the embodiment described below is an example in which the present invention is applied to a stirring container.

1 to 7, 1 is a stirring container (hereinafter, simply referred to as a container), 2 is a stirring liquid, 3 is a stirrer, 4 is a PH measuring device according to the present invention, 5 is a PH sensor (PH electrode). is there.

Here, the container 1 is formed in a cylindrical shape, and a drive portion 3a of the stirrer 3 is erected vertically upward at the center of the outer surface of the upper wall. The rotating shaft 3b of the stirrer 3 penetrates the upper wall of the container 1 and extends vertically downward in the container 1, and has a blade part 3c for stirring at its tip.

The PH sensor 5 is provided on the outer surface of the upper wall of the container 1 at a position where the PH sensor 5 is inserted into the container 1 through an opening 6 formed in the upper wall of the container 1 and a position where the PH sensor 5 is taken out of the container 1. There is provided a moving unit that supports the PH sensor so that the PH sensor can move back and forth.

The moving means is configured as follows.

That is, on the outer surface of the upper wall of the container 1, a tube body (nozzle) 7 that is in communication with the opening 6 and into which the PH sensor 5 can be inserted is fixed. The PH sensor 5 can be inserted into the flange portion 7a of the end portion of the tube body 7 on the side opposite to the fixed side, and the flange portion 8a of the main body 8A of the ball valve 8 that opens and closes the opening portion 6 is connected to the flange portion 7a. There is. The tubular body 7 and the ball valve body 8A correspond to the "tubular member that is attached to the container so that the opening of the container communicates with one end of the container and the PH sensor can be inserted" in the present invention. A lower support plate 9 having an opening 9a communicating with the through hole 8c of the ball-shaped valve body 8B is fastened to the other end flange portion 8b of the ball valve body 8A.

A ball-shaped valve body is used as a driving device for the ball valve 8.
A drive device 10 that opens and closes the valve by rotating 8B to change the direction of the through hole 8c is provided.

As shown in FIG. 3, the lower support plate 9 has the opening portion.
With a shape having substantially triangular portions on both sides of the circular portion having 9a,
A hole 9b is formed in each of the substantially triangular portions.

Bearings 11 are mounted in the pair of holes 9b, respectively.

An upper support plate 12 having the same shape as the lower support plate 9 is provided at a position vertically above the lower support plate 9 by a predetermined distance.
And are disposed opposite to each other.

The upper support plate 12 has openings 12 similar to the lower support plate 9.
A and a pair of holes 12b are formed, and a bearing 13 is mounted in each of the pair of holes 12b.

The upper support plate 12 and the lower support plate 9 are connected by a screw shaft 15 in a ball screw set 14, which will be described in detail later. A pair of the screw shafts 15 are prepared, one end of each of which is supported by a bearing 13 of the upper support plate 12 and the other end of which is supported by a bearing 11 of the lower support plate 9, and each extends in the vertical direction.

The screw shaft 15 is supported by bearings 11 and 13 so as to receive loads in the radial direction and the thrust direction, respectively.

The nut 16 of the ball screw set 14 is mounted on each screw shaft 15, and flanges 16a are formed at both ends of the nut 16, respectively. Above upper support plate 12
And a pair of slide plates 17, 18 having the same shape as the lower support plate 9 and having central openings 17a, 18a and a pair of holes 17b, 18b, respectively.
The slide plate 17 on the upper side is arranged with the hole 17b inserted in the outer periphery of the screw shaft 15 on the upper side of the pair of nuts 16, and the slide plate 17 in the longitudinal direction (see FIG. Both left and right ends are upper flanges of the pair of nuts 16 above.
It is fixedly attached to 16a. The other slide plate 18 is arranged with the hole 18b inserted through the outer periphery of the screw shaft 15 below the nut 16, and both ends of the slide plate 18 in the longitudinal direction (left and right in FIG. 1) are as described above. Lower flange 16a of a pair of nuts 16
It is fixedly attached to.

The PH sensor 5 has a rod portion 5A having a detection portion 5a at the tip.
And a signal output unit 5B that outputs a detection signal, and is arranged along a vertical line that passes through the center of the horizontal line that connects the two screw shafts 15 in the horizontal direction, and the rod unit 5A on the lower side. With the central opening 18a of the slide plate 18 inserted, the flange 5b formed at the lower end of the signal output unit 5B is fixedly attached to the central portion of the upper wall of the lower slide plate 18.

A signal line 19 for transmitting an output signal from the signal output unit 5B of the PH sensor 5 to a controller (not shown) or the like is connected.

The signal line 19 is formed in a coil shape, and its end portion is inserted into a ring 20 (FIG. 4) fixed to the upper support plate 12. The signal line 19 is formed into a coil shape and extends in a substantially straight line when pulled, but when the pulling force is removed, the signal line 19 returns to the coil shape again.

Here, the structure of the ball screw set 14 will be described.

Balls 21 for rolling bearings are placed in a row in a coiled space formed by facing the screw groove on the outer peripheral surface of the screw shaft 15 of this ball screw set 14 and the screw groove on the inner peripheral surface of the nut 16.
The ball 21 coming out from one end of the nut 16 is returned to the thread groove at the other end of the nut 16 through the hole of the nut 16.

Therefore, when each of the pair of screw shafts 15 is rotated, the pair of nuts 16 slides along the screw shafts 15, and the PH sensor moves up and down according to the rotation direction of the screw shafts 15.

The screw shaft 15 is rotated by the following rotating means.

That is, the sprocket is attached to the upper end of each screw shaft 15.
22 is fixedly attached. A roller chain 23 is wound around these sprockets 22. A rotating shaft 25a of a speed reducer 25 that reduces the rotation of the electric motor 24 is connected to one of the sprockets 22.

Therefore, when the rotational driving force of the electric motor 24 is transmitted to the one sprocket 22 through the speed reducer 25, the sprocket
The rotation of 22 is transmitted to the other sprocket 22 via the roller chain 23, and both screw shafts 15 rotate.

As a result, as described above, the pair of nuts 16 slide, and the PH sensor 5 is moved up and down in accordance with the rotation direction of the screw shaft 15 by controlling the rotation direction of the electric motor 24.

On the other hand, there is provided a liquid holding container 27 containing a liquid (distilled water or buffer solution) 26 for protecting or certifying the tip detection unit 5a of the PH sensor 5 by immersing the tip detection unit 5a in the liquid holding container 27.
Is rotatably supported by the supporting means so as to be rotatable between a movement path position of the PH sensor 5 outside the container 1 and a position deviated from the movement path position.

That is, the liquid holding container 27 is formed in a cylindrical shape with an open upper surface, and one end of a pair of curved swing arms 28 is fixedly attached to two positions vertically spaced apart from the peripheral wall of the liquid holding container 27. (Fig. 3). The other end of the swing arm 28 is fixedly attached by being inserted through the outer periphery of a rotary shaft 29 extending in the vertical direction. The lower end of the rotating shaft 29 has the lower support plate 9
It is rotatably supported by a support plate 30 fixedly attached to one of the substantially triangular portions.

In this embodiment, the rotating shaft 29 is provided with a driving device 31 as a moving device for the liquid holding container 27, and the driving device 31 of the rotating shaft 29 rotates the rotating shaft 29 by a predetermined angle. Then, the liquid holding container 27 is selectively moved to a position above the opening 9a of the lower support plate 9 and a position other than above the opening 9a (for example, a position near one screw shaft 15).

Next, the operation of this configuration will be described.

When measuring the pH of the liquid in the container 1, as shown in FIG. 4, the PH sensor at the uppermost position is lowered.

That is, first, the ball valve 8 is opened, and the liquid holding container 27 is rotated and moved to a position near one screw shaft 15 other than above the opening 9a of the lower support plate 9.

When the electric motor 24 is driven to the lower side of the PH sensor 5, the rotational driving force of the electric motor 24 is passed through the speed reducer 25 to the one sprocket 22
And the rotation of the sprocket 22 is transmitted to the roller chain.
It is transmitted to the other sprocket 22 via 23 and both screw shafts 15 rotate. As a result, the pair of nuts 16 slide downward and the PH sensor 5 is lowered.

The tip of the PH sensor 5 has an opening 9a in the lower support plate 9,
After passing through the through hole 8c of the valve body 8B of the ball valve 8 and the inside of the tube body 7, the ball valve 8 is inserted into the container 1 through the opening 6 and rushed into the liquid 2 in the container 1 (see FIG. 5). .

In this case, the lower slide plate 18 is brought into contact with and supported by the upper surface of the lower support plate 9.

When the PH measurement is completed, the motor 24 is driven to the PH sensor 5 rising side this time, the pair of nuts 16 slide upward, the PH sensor 5 is lifted, and the PH sensor 5 is set to the uppermost position in FIG. 4 again. To be done.

Then, the ball valve 8 is closed and the liquid holding container is
27 is rotated and moved to a position above the opening 9a of the lower support plate 9. Then, drive the electric motor 24 to the lower side of the PH sensor 5,
The PH sensor 5 is lowered, and the tip detection part 5a of the PH sensor 5 is immersed in the liquid 26 in the liquid holding container 27 and stands by for the next PH measurement (see FIGS. 6 and 7).

By immersing the tip detection unit 5a of the PH sensor 5 in the liquid 28 of the liquid holding container 27, if the liquid 28 is a protective liquid, the container 1
Since it is not left to rush into the liquid 2 inside, the PH sensor 5 is protected without being deteriorated in accuracy, damaged, or damaged by the influence of stirring of the liquid. If the liquid 28 is a test liquid, a test (correction) for correcting the deviation of the detection unit 5a of the PH sensor 5 is performed.

In the above operation, the pressure inside the container 1 is maintained by closing the ball valve 8 during the operation of the container 1.

According to the PH measuring device 4 having the above configuration, the PH sensor 5 is automatically put in and taken out from the container 1,
Since it is possible to prevent the PH sensor 5 and the container 1 from being damaged and the PH sensor insertion work and the like that require careful work can be eliminated, workability can be improved.

In particular, since the PH sensor 5 is only caused to perform a simple operation of raising and lowering, it is possible to further improve the protection of the PH sensor 5 which is a precision device.

Further, in the present embodiment, since the moving means for raising and lowering the PH sensor 5 is constituted by using the electric motor 24, the speed reducer 25, the sprocket 22, the roller chain 23, and particularly the ball screw set 14, the PH sensor 5 is used. A soft operation can be given, and the protection of the PH sensor 5 can be further improved.

In this case, in the ball screw set 14, the screw shaft 15
Balls for rolling bearings are placed in a row in a coiled space formed by facing the screw groove on the outer peripheral surface and the screw groove on the inner peripheral surface of the nut 16, and when the screw shaft 15 rotates, the screw groove at one end of the nut 16 The ball coming out of the nut is returned to the thread groove at the other end of the nut 16 through the hole of the nut 16, and the nut 16 slides along the screw shaft 15. Compared with the above, the sliding movement of the nut 16 is performed softly without rattling, the PH sensor 5 is not impacted, and the PH sensor 5 can be moved smoothly.

Furthermore, since the detection unit 5a of the PH sensor 5 is immersed in the liquid 26 while the container 1 is in operation, the liquid 2 in the container 1
Since it is not left in the inside, the PH sensor 5 can be protected without being deteriorated in accuracy, damaged, or damaged by the influence of the stirring of the liquid 2.
It is possible to perform verification (correction) of the detection unit 5a of the sensor 5,
As a result, more precise measurement becomes possible.

Further, according to this configuration, since the liquid holding container 27 is configured to be rotatably supported between the movement path position of the PH sensor 5 outside the container 2 and the position deviated from the movement path position, When a drive means for the liquid holding container 17 is provided, a drive device for a rotating shaft 29 that rotates a swing arm 28 that is the supporting means.
It is sufficient to provide 31. Since the drive device 31 does not have a moving part itself and does not need to take a large installation place, for example, the structure on the upper side of the container 1 can be kept compact.

Such an advantage has a great effect when a plurality of liquid holding containers 17 are provided.

That is, a plurality of liquid holding containers 17 may be provided, and the protective liquid, the assay liquid, etc. may be individually put in each liquid holding container 17, but in this case, another new liquid is provided on the outer circumference of the rotating shaft 29 shown in the figure. A plurality of liquid holding containers may be attached to one supporting means by, for example, fixing the swing arm of the holding container.

Therefore, even if a plurality of liquid holding containers 17 are provided, only a single drive device 31 needs to be provided, and the installation place is not wide.

It should be noted that a new means for supporting the liquid holding container may be separately provided (for example, on the other substantially triangular portion of the lower support plate 9). In this case, the drive device 31 also needs to be added. As described above, the drive device 31 does not have a moving part itself and does not need to take a large installation space.

On the other hand, the liquid holding container 27 is connected to the PH sensor 5 outside the container 2.
Of the liquid holding container 27 when it is configured to move linearly between the position of the moving path and the position deviated from the position of the moving path.
As a configuration for linearly moving, for example, it is necessary to provide a slide type drive device such as a cylinder device, and since this slide type drive device has a moving part itself, it is necessary to take a large installation place. When the structure around the container 1 cannot be kept compact and a plurality of liquid holding containers 17 are to be provided, it is necessary to provide a plurality of slide type driving devices according to the number of the liquid holding containers 17. Therefore, the installation place is considerably large, and it is difficult to install the plurality of liquid holding containers 17.

Further, in this embodiment, as described above, the liquid holding container
Since 27 is automatically moved by the driving device 31, there is no need to manually operate the liquid holding container 27,
Workability can be improved.

In addition, between the opening 6 formed in the container 1 and the supporting device
A pipe 7 through which the PH sensor 5 can be inserted is connected, and a ball valve 8 through which the PH sensor 5 can be inserted when the valve is opened is inserted in the pipe 7.
Since the opening 6 can be closed when the PH sensor 5 is taken out of the container 1, the container 1 can be reliably kept airtight during operation of the container 1 without detection by the PH sensor 5. It is effective for maintaining internal pressure.

In the present embodiment, the driving device 31 is provided as a moving device for the liquid holding container 27 in addition to the supporting means for the liquid holding container 27, but the driving device 31 is omitted and the liquid holding container 27 is manually rotated. You may let me.

<Effects of Device> As described above, according to the PH measuring device for a container of the present invention, the PH sensor is configured to be automatically taken in and out of the container through the opening of the container. ,
It is possible to prevent damage to the container, improve workability, and improve the protection of the PH sensor, which is a precision instrument.

Also, when the PH sensor is not in use, the detection part can be immersed in the liquid, so the PH sensor can be protected without being degraded, damaged, or damaged. In addition, the detection part of the PH sensor can be verified (corrected), and more precise measurement can be performed.

In particular, according to the present invention, since the PH sensor moving means is configured by using a ball screw set, the PH sensor slide movement is performed softly without rattling, and the PH sensor is not given a shock or the like. There is an advantage that the sensor can be moved smoothly.

Further, since the liquid holding container is configured to be rotatably supported between the movement path position of the PH sensor outside the container and a position deviated from the movement path position, for example, the liquid holding container is automatically moved. When the rotating means for rotating is provided, since this rotating means does not have a moving part itself, it is not necessary to take a large installation space, and the structure around the container can be suppressed to a compact size. This is more effective when a plurality of containers are provided.

Further, according to the present invention, since the opening can be closed when the PH sensor is taken out of the container, it is possible to reliably maintain the airtightness inside the container when the container is not detected by the PH sensor. Practical effects are large, such as the advantage that it is effective for maintaining internal pressure.

[Brief description of drawings]

FIG. 1 is a front view of a container to which an embodiment of the PH measuring apparatus for a container according to the present invention is applied, FIG. 2 is an enlarged sectional view of the PH measuring apparatus in the same embodiment, and FIG. 3 is a liquid in the same embodiment. The plan view of the holding container and FIGS. 4 to 7 are views for explaining the operation of the above-mentioned embodiment. 1 ... Stirring container, 2 ... Stirring liquid, 4 ... PH measuring device, 5
…… PH sensor, 6 …… Opening, 8 …… Ball valve, 9 ……
Lower support plate, 10 ... Drive device, 12 ... Upper support plate, 14 ...
… Ball screw set, 15 …… Screw shaft, 16 …… Nut, 1
7,18 …… Slide plate, 22 …… Sprocket, 23 …… Roller chain, 24 …… Motor, 25 …… Reducer, 26 …… Liquid,
27 …… Liquid holding container, 28 …… Swing arm, 29 …… Rotating shaft,
31 …… Drive device

Claims (2)

[Scope of utility model registration request] 1. A movement for reciprocatingly supporting a PH sensor so as to reciprocate between a position to be inserted into the container and a position to be taken out of the container through an opening formed in the container. Means and a liquid holding container for containing a liquid for protecting or assaying by immersing the tip detection part of the PH sensor between the movement path position of the PH sensor outside the container and a position deviated from the movement path position. And a means for supporting the liquid holding container which is rotatably supported by the means for supporting the pH sensor, and the means for moving the PH sensor is attached to the container such that one end of the PH sensor communicates with the opening of the container, An annular lower support plate attached to the other end of the insertable tubular member, and an upper side disposed vertically above a predetermined distance from the lower support plate so as to face the lower support plate. A support plate, the upper support plate and the lower support And a pair of screw shafts, one end of which is rotatably supported by the upper support plate and the other end of which is rotatably supported by the lower support plate. A pair of nuts, each equipped with
Balls for rolling bearings are placed in a row in a coiled space formed by facing the screw groove on the outer peripheral surface of the screw shaft and the screw groove on the inner peripheral surface of the nut. A ball screw set in which the pair of nuts slides along the screw shaft by rotation of the pair of screw shafts. The PH sensor is a slide plate that is fixedly attached to the pair of nuts and moves integrally with the nuts, and is arranged along a vertical line passing through a horizontal line connecting the pair of screw shafts in the horizontal direction. A PH measuring device for a container, comprising: a slide plate to which an upper end portion of is fixedly attached, and a rotating means for rotating the pair of screw shafts. 2. A tubular member attached to an opening of a container is provided with a ball valve through which a PH sensor can be inserted when the valve is opened, and the opening can be closed when the PH sensor is taken out of the container. The PH measuring apparatus for a container according to claim 1, wherein the PH measuring apparatus is configured as described above.