RU2619314C1 - Method of level sensor implementation - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: method of the level sensor implementation includes manufacturing the base and placing the sensing elements through the openings arranged therein, including the common electrode and/or the electrode for monitoring the presence of liquid in the bath, connected to the level control device. Placing the sensing elements is made with the possibility of their vertical movement and fixing their position within the passage bushings made with thread and trunnion clamps or connected to threaded elements equipped with trunnion clamps used for fixing the elected position of the electrodes, connected to the lower surface of the base the level sensor and/or the bracket for accommodating the latter, by means of nuts fixing the selected positions of the sensing elements. Wherein the metal electrodes are placed either in tubes made of non-conductive material or in the common screen.

EFFECT: expansion of the functionality of the method while adjusting the position of the level sensor electrodes and reducing the probability of false positives.

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Description

The invention relates to methods for controlling the level of a liquid processing medium and can be used to control the level of both heated and unheated electrolytes, solutions and / or rinsing water in bathtubs of galvanic lines, including those operating in a two-level layout and operating in a closed mode, with the help of the sensing elements lowered into the baths, connected to the corresponding inputs of the level control devices.

A known method of controlling the level of electrolytes, solutions and / or washing water in bathtubs of galvanic lines using two contact metal electrodes lowered into the bathtubs connected to the corresponding inputs of the level control device, made in the form of a relay [1].

A disadvantage of the known method is its relatively limited functionality, which does not allow level control at several points corresponding, in particular, to the height of the active part of electric heaters, for example, an immersion type, and / or overflow edge of a pocket or upper part of the suspension when it is loaded in the bath position or maximum height of the electrolyte / solution level in the bath after loading large-sized or volumetric parts into it.

Closest to the proposed technical essence and the achieved result, the known solution, selected as a prototype, is a method for implementing a level sensor, including the manufacture of the base and static placement, through the holes located in it, of n-sensitive elements made in the form of vertical metal electrodes and connected to the corresponding inputs of the level control device, where n = 4, including the common electrode [2].

The disadvantage of this method, selected as a prototype, is its relatively limited functionality and high labor costs, respectively, not allowing or making it difficult to adjust the height of the electrodes in the bath when they are upright in the bath, which may be due to the need for their "adjustment" for example, when using level sensors in bathtubs with different heights of the overflow pocket edges or different heights of the upper edges of suspensions immersed in bathtubs with parts and / or various dimensions of the latter, as well as when replacing immersion-type electric heaters with a different, from previously used, height of their active part, etc.

Another disadvantage of the known method, selected as a prototype, is also the relatively high probability of false alarms of the level sensor, due to the waves and / or splashes generated on the surface of its metal electrodes generated when the surface of the mirror mirrors the liquid in the bath due to the water being supplied to the bath for replenishment of losses of its liquid by turning on bubbling after loading parts into it and / or turning on the filter unit and / or loading large or volume parts into the bath, and e inclusion collectors work for jet flushing dynamic and others.

A new technical result is to expand the functionality of the method, reducing labor costs when adjusting the position of the electrodes of the level sensor and reducing the likelihood of false positives of the latter when it controls the selected values of the liquid level in the bath.

A new technical result is achieved by the fact that in the known method of implementing the level sensor, including the manufacture of the base and the placement, through the holes located therein, of n-sensitive elements, including a common electrode and / or electrode for monitoring the presence of liquid in the bath, made in the form of vertical metal electrodes and connected to the corresponding inputs of the device for level control, according to the invention, the placement of sensitive elements is performed with the possibility of their vertical movement and fixation its position inside, detachably or non-detachably connected to the lower surface of the base of the level sensor and / or bracket for accommodating the last, bushings made with thread and trunnion clamps or detachably or not releasably connected to threaded elements equipped with trunnion clamps used to fix the selected the positions of the electrodes with nuts fixing the selected positions of the sensitive elements, while the metal electrodes, with the exception of the common and / or electrode for monitoring the presence of I liquid in the bath, when used, is placed either in tubes of non-conductive material, or in a common screen mechanically connected to the base of the level sensor.

, определяют из соотношения:Moreover, with n = 4, including the common electrode, the number of sensitive elements that are capable of vertical movement and subsequent fixation

, determined from the ratio:

, определяют из соотношения:and at n = 5, including a common electrode and an electrode for monitoring the presence of liquid in the bath, the number of sensitive elements made with the possibility of their vertical movement and subsequent fixation

, determined from the ratio:

In this case, the upper part of each, except for the common electrode and / or electrode for controlling the presence of liquid in the bath, is placed in a detachable or not

detachable connected to the inner surface of the base of the level sensor, a bushing of non-conductive material equipped with a vertical through groove for moving through it mechanically connected with a nut located in the upper part of the electrode, a terminal with a wire connected to it, connected to the corresponding input of the device level control.

And the magnitude of the change in the position of the sensitive elements (Δh), from the height of their initial value in the bath (h _{0, i} ), corresponding at least to the position of the active part of the electric heating elements installed in the bath (h _0,1 ), the position of the upper edge of the device with details when it is loaded into the bath state (h _0.2 ) and the edge of the overflow pocket (h _0.3 ), choose within:

h _{0, i} -50 mm ≤Δh≤h _{0, i} +50 mm,

where i = 1, 2, 3.

At the same time, the common screen is made in the form connected by an internal thread to an installation sleeve equipped with an external thread and not detachably or detachably connected to the external surface of the base of the level sensor, a nozzle made of highly transparent polypropylene or polyethylene or glass, the height of which is chosen to be greater than or equal to the distance from the bottom the edges of the installation sleeve to the beginning of the active part of the electric heating elements immersed in the bath.

In addition, to increase the convenience and more objective adjustment of the vertical position, at least made with the possibility of vertical movement and subsequent fixation of the electrodes, a centimeter scale is applied to the surface of their tubes of non-conductive material or the electrodes themselves, at least within Δh with appropriate divisions or risks, respectively.

A comparative analysis of the proposed solutions with the prototype shows that the proposed method allows to provide:

- enhanced functionality and less labor, respectively, allowing to make and making it easier and more objective to adjust the height of the electrodes in the bath when they are upright;

- reduction of the probability, up to the exception, of false alarms of the level sensor, due to the almost complete elimination of waves and / or splashes on the surface of its metal electrodes generated due to disturbances of the liquid surface in the bath caused by bubbling and / or switching on the filter installation and / or loading into the bath of large-sized or volumetric parts, etc.

Thus, the claimed method meets the criteria of the invention of "novelty."

When studying other well-known technical solutions in this technical field, the features that distinguish the claimed invention from the prototype were not identified and therefore they provide a technical solution that meets the criterion of "significant differences".

The invention is illustrated by drawings.

In FIG. 1 presents, placed in a bath 1 of non-conductive (in this case) material, equipped with an overflow pocket (not indicated in FIG. 1) and electric immersion heating elements 2, an embodiment of a level sensor, including, mounted on the bracket 3, the housing 4 is rectangular (in in this case) forms with openings (located in its base 5 and in the mounting platform 6, respectively, of the housing 4 and the bracket 3, holes (not shown in Fig. 1) connected to the corresponding inputs of the level control device (on d. 1 is not shown), and placed (in this case) in tubes of non-conductive material (not shown in FIG. 1) with a common vertical metal electrode (not shown in FIG. 1) and vertical metal electrodes 7, 8 and 9 made with the possibility of moving them vertically inside the holes, detachably connected to the lower surface of the mounting pad 6 of the bracket 3 of the bushings, respectively, 10, 11 and 12, made (in this case) with a thread and a trunnion clip (in FIG. 1 are not indicated and are not shown, respectively), used to fix the selected position of the electrodes 7, 8 and 9, using nuts 13, 14 and 15, respectively.

At the same time, to improve the convenience and more objective adjustment of the vertical position of the metal electrodes 7, 8 and 9, a centimeter scale with corresponding divisions can be applied, at least within the Δh value, to the surface of their tubes of non-conductive material (in this case) (not shown in FIG. 1).

In FIG. 2 shows a local cutout A in FIG. 1, which shows the upper part, located directly in the housing 4, of the electrode 9 (in this case) in a tube (not shown in FIG. 2) of a non-conductive material placed in a through sleeve 16 of a non-conductive material made with a vertical through groove 17 for moving through it mechanically connected by means of a nut interacting with a thread formed in the upper part of electrode 9 (not indicated in FIG. 2), terminals 18 with a wire connected to it (not indicated in FIG. 2).

In FIG. 3 presents, placed in a metal (in this case) bathtub 1, equipped with an overflow pocket (not indicated in FIG. 1) and submersible electric heating elements 2, an embodiment of a level sensor with a local cutout, including, mounted on the bracket 3, the body 4 is round ( in this case) molds with vertical metal electrodes 7 placed through openings located in the base 5 of the housing 4 (not indicated in FIG. 1) connected to the corresponding inputs of the level control device (not shown in FIG. 1), with the possibility of their vertical movement inside the holes rigidly connected to the lower surface of the base 5 of the housing 4 of the through bushings 10, made (in this case) with a thread and a trunnion clamp (not shown and not shown in Fig. 1, respectively) used for fixing the selected position of the electrodes 7, using nuts 13.

In this case, in this embodiment, the level sensor, its base 5 of the housing 4 is made with the mounting sleeve 19 placed through the hole in the mounting pad 6 (not indicated in FIG. 3), with the thread of which mates, directly or through an elastic gasket (on Fig. 3 is not indicated), in the upper part is equipped with a threaded shielding pipe 20 of non-conductive material.

And on the surface of the metal electrodes 7, 8 and 9 (in this case) risks can be applied (not shown in Fig. 1), at least within the limits of Δh, of the centimeter scale with the corresponding divisions.

In FIG. 4 shows a section BB in FIG. 3.

The implementation of the level sensor is carried out in the following way.

Initially, depending on the material of the bathtub body (plastic or metal), as well as the type of level sensor (Fig. 1 or Fig. 3), the tubes placed in the tubes are made of non-conductive material or without them:

- a common vertical metal electrode or flexible conductor connected to the body of the bath, in the case of its manufacture from metal (Fig. 3);

- an electrode used to control the presence of liquid in the bath 1 (if necessary);

- vertical metal electrodes 7, 8 and 9 (see Fig. 1), respectively, with a length approximately corresponding to:

- the distance from the connection, using a nut, terminal 18 with the thread located in the upper part of the common and / or used to control the presence of liquid in the bath 1 of the electrodes (see Fig. 2);

- the active part of the electric heating elements installed in the bathtub (h _0,1 ), the position of the upper edge of the device with parts when it is in a condition (h _0,2 ) and the edge of the overflow pocket (h _0,3 ) and is selected within:

,

,

where i = 1, 2, 3.

Further, in the open position of the housing 4 of the level sensor, through the holes in the base 5 and the mounting pad 6, respectively, of the housing 4 and the bracket 3, as well as through the hole of the bushing with a thread and a trunnion clamp (not shown in Fig. 2), sequentially :

- installation placed in a tube of non-conductive material (in this case) a common vertical metal electrode (not shown in Fig. 1, 2) with a maximum length that provides constant contact with the liquid in the entire range of control of its level in the bath 1;

- installation, if necessary, also placed in a tube of non-conductive material of a vertical metal electrode (not shown in Fig. 1, 2) used to control the presence of liquid in the bath 1;

- their subsequent fixation with the help of nuts, which ensure, when tightening the sleeve thread, a reliable clamp in the “paws” of the pin (not shown in Fig. 2) placed in tubes of a non-conductive material of a common vertical metal electrode, as well as the electrode used to control the presence of fluid in bath 1 (if necessary).

Then, in the same way as described above, through the bushings 16 of non-conductive material, equipped with vertical through-slots 17, are installed and pre-fixed using nuts 13, 14, 15 placed (in this case) in tubes of non-conductive material (on Fig. 1 is not indicated) vertical metal electrodes 7, 8 and 9, used, respectively, to control the level of approximately corresponding (in this case):

- the height of the active part of the immersion electric heating elements;

- the position of the upper edge of the device with parts when it is loaded into the bath;

- the position of the edge of the overflow pocket or the level height of the liquid processing medium in the bath after loading devices with parts into it.

In the same way, the metal electrodes 7 of the level sensor shown in FIG. 1, made without tubes of non-conductive material, are also installed. 3, 4, without installing, at this stage, a shielding pipe 20 of non-conductive material.

In this case, as the common electrode, the body of the metal bath 1 is used, connected by a flexible conductor (not indicated in Fig. 3) with the corresponding input of the level control device (not shown in Fig. 3).

After that, if the bath is an object with a heated processing medium, vertical immersion (see Figs. 1, 3) or bottom electric _heating elements 2 are installed in the bath 1 with the corresponding height of their active part (h _{a .h.} ).

Next, unscrewing the nut 13 and using a centimeter scale with the appropriate divisions on the surface of the tube (see Fig. 1) or the risks on the surface of the metal electrode (see Fig. 3), make the corresponding adjustment of the position of the electrode 7, to enable optimal control of emergency lowering the liquid level in the bath 1 until the liquid reaches the active part of the electric heating elements 2, the value of the time for which is determined by the time of evaporation of the liquid from the bath 1 and the parameters used means of control and / or regulation.

Then, using the nut 13, fix the selected position of the electrode 7 in the bath 1.

Then, a rod with a suspension having a maximum height is loaded into the bath 1, according to the value of which, in the same way as described above, the position of the electrode 8 in the bath 1 is adjusted using the nut 14.

In the same manner as described above, the final installation of the electrode 9 in the bath 1 is carried out.

And for the construction of the level sensor shown in FIG. 3, additionally install a threaded shielding pipe 20 of non-conductive material connected to the thread placed through

an opening in the mounting pad 6 of the bracket 3 (not indicated in FIG. 3) of the mounting sleeve 19.

After that, the appropriate processing medium is poured into the bath 1 equipped with a level sensor and its inclusion in the work.

At the same time, the necessary additional adjustment of the position of the electrodes is at least 7, 8, 9, which may be due, for example, to the need for their "adjustment", respectively:

- when replacing immersion-type electric heaters with a different, from previously used, height of their active part;

- with increasing temperature of the processing medium of the bath 1, which, as a consequence, can lead to the need to increase the volume, the essence of the supply time, the liquid supplied earlier, to ensure the constancy of the reaction time to the loss of the volume of liquid in the bath manually or automatically;

- when replacing the bath, with another, for example reduced, the distance of the upper edge of the overflow pocket of the bath from the upper edge of the horizontal frame of the latter,

produced directly in the bath 1, with the housing 4 and / or the shielding pipe 20 removed (if necessary) and the locked positions of the nuts 13, 14, 15 (in this case).

Then they make the final, after additional adjustment, using a centimeter scale with the appropriate divisions on the surface of the tubes (see Fig. 1) or risks on the surface of the metal electrodes (see Fig. 3), installation of electrodes 7, 8 and 9 (in this case ) in the bath 1.

At the same time, the use of tubes made of non-conductive material or a common screen made in the form of a pipe 20 allows one to almost completely eliminate the possibility of false alarms of the level sensor with conductometric electrodes, due to unrest, splashes, etc.

Thus, the proposed method in comparison with the known, selected as a prototype, allows you to provide:

- expanded functionality that allows making and making it easier and more objective to adjust the height of the electrodes in the bath when they are upright;

- reduction of labor costs when adjusting the position of the electrodes of the level sensor;

- reducing the likelihood of false alarms of the level sensor when it controls the selected values of the liquid level in the bath.

The implementation of the proposed method is quite simple and does not meet fundamental difficulties.

So, as a material of conductivity probes - metal electrodes, a VT1-0 titanium rod / wire with a diameter of 3-4 mm can be used.

As a non-conductive material, a fluoroplastic tube of the F-4D grade of the corresponding internal diameter can be used.

As threaded bushings with threaded pins and trunnion clamps, both standard products and specially manufactured ones can be used, parts obtained by casting into the appropriate molds of a thermoplastic material, for example polypropylene or polyethylene.

And the base of the level sensor with an integral sleeve with an external thread and its body can also be made by molding thermoplastic material (polypropylene, polyethylene) under pressure in the corresponding molds.

In addition, in the same way, a common screen made of highly transparent polypropylene, polyethylene or glass can be made in the form of a pipe connected by an internal thread to a sleeve equipped with an external thread and not detachably or detachably connected to the external surface of the base of the level sensor.

As a device for level control, in particular, with n = 4, including a common electrode, a commercially available three-channel level control device of the SAU-M6 type can be used.

Verification of the proposed method in the manufacture of the base and body of level sensors made of polyvinyl chloride with metal electrodes made of titanium, placed in fluoroplastic tubes and their use as part of the closed-line chromium-plating made in a two-level layout, showed its effectiveness in terms of the claimed improvements, in comparison with the method selected as a prototype, and with other solutions in this area.

INFORMATION SOURCES

1. UDC [621.357.7: 658.52.011.56.012.3] (035) Flexible automated galvanic lines: Reference. Under the total. ed. V.L. Zubchenko. - M .: Engineering, 1989, p. 527, Fig. four.

2. Passport and operating manual for the three-channel SAU-M6 level control device, manufactured by OVEN (Moscow), pp. 2, 6, 12 - prototype.

Claims (11)

1. The method of implementation of the level sensor, including the manufacture of the base and placement through the holes located therein of n-sensitive elements, including a common electrode and / or electrode for monitoring the presence of liquid in the bath, made in the form of vertical metal electrodes and connected to the corresponding inputs of the control device level, characterized in that the placement of sensitive elements is performed with the possibility of their vertical movement and fixing their position inside detachably or permanently connected to the surface of the base of the level sensor and / or the bracket for accommodating the last bushings made with threads and trunnion clamps and releasably or permanently connected to threaded elements equipped with trunnion clamps used to fix the selected position of the electrodes with nuts fixing the selected positions of the sensitive elements, while metal electrodes, with the exception of the common and / or electrode to control the presence of liquid in the bath when using those, are placed either in tubes of non-conductive material, or in general the screen is mechanically connected to the level sensor base. 2. The method according to p. 1, characterized in that at n = 4, including the common electrode, the number of sensitive elements that are capable of vertical movement and subsequent fixation

, determined from the ratio:

and at n = 5, including a common electrode and an electrode for monitoring the presence of liquid in the bath, the number of sensitive elements made with the possibility of their vertical movement and subsequent fixation

, determined from the ratio:

3. The method according to p. 1, characterized in that the upper part of each, except for the common electrode and / or electrode for controlling the presence of liquid in the bath, is placed in a plug-in sleeve that is permanently connected to the inner surface of the base of the level sensor from a non-conductive material equipped with a vertical a through groove for moving through it mechanically connected by means of a nut interacting with a thread located in the upper part of the electrode, terminals with a wire connected to it, connected to the corresponding input at the level of the control device. 4. The method according to p. 1, characterized in that the magnitude of the change in the position of the sensitive elements (Δh) from the height of their initial value in the bath (h _{0, i} ), corresponding at least to the position of the active part of the electric heating elements installed in the bath (h _0,1 ), the position of the upper edge of the device with parts when it is loaded into the bath (h _0.2 ) and the edge of the overflow pocket (h _0.3 ), is chosen within: h _{0, i} -50 mm≤Δh≤ h _{0, i} +50 mm, where i = 1, 2, 3. 5. The method according to p. 1, characterized in that the common screen is made in the form of a joint connected by an internal thread with an installation sleeve equipped with an external thread and permanently or detachably connected to the external surface of the base of the level sensor, a nozzle made of highly transparent polypropylene, or polyethylene, or glass, whose height (h _e ) is chosen to be greater than or equal to the distance from the lower edge of the installation sleeve to the beginning of the active part of the electric heating elements immersed in the bath. 6. The method according to any one of paragraphs. 1 or 4, characterized in that to improve the convenience and more objective adjustment of the vertical position, at least made with the possibility of vertical movement and subsequent fixation of the electrodes on the surface of their tubes of non-conductive material or the electrodes themselves are applied, at least within the range of Δh centimeter scale with appropriate divisions or risks, respectively.

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