CN2469451Y - PH value autodetecting device with double glass electrode - Google Patents

Abstract

The utility model relates to a double glass electrode pH value detecting device belonging to the technical field of the pH value automatic measuring instrument, and aims primarily to solve the puzzle that the signal is not interrupted when the scale deposit is cleared in the pH value online automatic detection process. The main technical characteristic is that the utility model comprises the A and the B groups of electrodes, and each group is consists of a magnet 18, an upper and a lower magnetic Hall switches 17, 22, an electrical motor 16, a rack 13, a pinion 15 and an electrode 25, and so on. Both groups of electrodes are all cleaned through the acid liquor sprayed from a spray acid nozzle 28, and use a blocking acid board 29 to block up the leakage of the acid liquor; while a direction control rod 05 controls the direction of the blocking acid board and the spray nozzle; and the processes of the examination and the cleaning are performed via the mutual alternation of the two groups of electrodes controlled by a computer, which enables the survey signal not being interrupted caused by the cleaning of the scale deposit, and enhances the stability of the examination signal and the accuracy of the data, thus ensuring the precision and the reliability of the pH value online automatic control.

Description

Two glass electrode pH value automatic detection devices

Two glass electrode pH value detection devices are mainly used in the online automatic detection of pH value in the automatic control in engineering fields such as sugaring, chemical industry, environmental protection.

According at present domestic and all be single electrode from device that external import is used for pH value online automatic detection, their major defects are in testing process, because the boundary's matter that is detected generally all has a lot of colloids and impurity, through certain hour, these colloids and impurity form incrustation with regard to clinging glass electrode, cause the measuring accuracy of glass electrode to descend.In order to remove these incrustation of glass electrode,, must leave the medium of being surveyed to the electrode lifting every 5～8 minutes, and by high-pressure spray gun electrode be cleaned with phosphoric acid with the signal accuracy that guarantees to detect.At this moment, therefore the signal that is detected just interrupts, and it is unstable to cause automatic control process to occur because of signal is discontinuous, greatly reduces the precision and the reliability of automatic control.

The utility model designs in order to overcome above-mentioned shortcoming.Adopt two groups of glass electrodes to form a whole, every group of electrode is made up of parts such as electrode, motor, pinion wheel, tooth bar, last downcomer, last magnetic Hall switch respectively.Its middle rack is a triangular form, places fixing triangular form chute.Be equipped with in the bottom of triangular form tooth bar and turn to slide block, on slide block, have spiral to turn to chute.In tooth bar moved up and down process, spiral turned to chute to drive the fork that turns on the direction control lever, and made direction control lever also rotation direction thereupon.Be equipped with a magnet on the next door of slide block, by the effect of magnet and last magnetic Hall switch, the stroke up and down of control electrode.

There is a pin upper end of direction control lever, with it the direction control lever is hung on the set screw seat.Have two to turn to fork again, two turn to the angle of fork mutual alignment is 90 °, and the soft acid inlet tube of moulding is equipped with at the middle part, so that do not influence the rotation of direction control lever.Chew to spraying acid in the hole that the direction control lever center of acid inlet tube bottom has in the retaining acid plate of straight-through its underpart, hole.Keeping off sour plate level position and be in two centres that turn to fork, respectively is 45 °.Chew the direction that aligns glass electrode by direction control lever control sour plate of retaining and spray acid.By the processing and the control of computer, two arrays of electrodes takes turns mutually, circulates and detect and clean, and guarantees that the signal surveyed not only accurately but also continuous, has improved the accuracy and the reliability of automatic control.

For the acid solution after preventing to clean leaks, the cavity of forming a sealing in the space that electrode cleans with pallet, cloche and casing, and have an acid discharge road in a side of body, so that the acid solution after cleaning is collected back in the body, flow back to acid storing tank by the acid discharge mouth again.

Below in conjunction with accompanying drawing the utility model is described in further detail.Wherein Fig. 2～Fig. 7 is schematic partial top view of the utility model and front elevation

Fig. 1. be that the utility model schematic perspective view diagram 2 is that the utility model is worked as the A electrode and detected, fork and the sour Board position figure Fig. 3 of retaining were that the utility model is worked as the A electrode and detected when the B electrode cleaned, A when the B electrode cleans, B two electrode position figure Fig. 4 are that the utility model is worked as the A electrode and detected, fork and the sour Board position figure Fig. 5 of retaining were that the utility model is worked as the A electrode and detected when the B electrode was awaited orders, A when the B electrode is awaited orders, B two electrode position figure Fig. 6 are that the utility model is worked as the A electrode and cleaned, fork and the sour Board position figure Fig. 7 of retaining were that the utility model is worked as the A electrode and cleaned when the B electrode detected, A when the B electrode detects, B two electrode position figure

Shown in Figure 1 as Figure of description, sampling groove 02 places on the base 01, and tested fluid flows through the sampling groove from left, and then from right-hand outflow, A electrode 03 puts in the sampling groove and detects, and collects data-signal and is sent to computer continuously and handle.And this moment, B electrode 25 has risen to predetermined height, and magnet 18 presses close to go up magnetic Hall switch 17, just stops operating after B group motor 16 is received signal.And direction control lever 05 also drives Turn-round slide plate 09 rising in tooth bar 13 uphill process, spiral on slide plate turns to chute 08 promptly to drive and turns to fork 07 that direction control lever 05 is turned right 45 °, make sour plate 29 of retaining and spray acid chew 28 and align B electrode 25 (as shown in Figure 2).Computer instruction acid pump starts then, acid solution with certain pressure is by the flow through hole at acid inlet tube 06 approach axis control lever 05 center of acid inlet 24, the hole of retaining in the sour plate 29 of flowing through then chewed 28 and ejected from spraying acid at last, and B electrode 25 is cleaned (as shown in Figure 3).Acid solution after the injection flows to mainframe box 21 by the acid discharge road 27 on the pallet 04, flows back to acid storing tank from acid discharge mouth 26 then.In order to prevent that acid solution from leaking, the electrode surrounding space on the pallet fences up with cloche 23.

After time, computer instruction B group motor 16 starts through preset detection, and tooth bar 13 begins to move down under the transmission of pinion wheel 15.And Turn-round slide plate 09 also moves down simultaneously, spiral on it turns to chute 08 also inwardly to change 45 ° along with drive turns to fork 07, direction control lever 05, the sour plate 29 of retaining, spray acid are chewed 28 and have also been changeed 45 ° (as shown in Figure 4) along with inside, and B electrode 25 just puts in the groove 02 of sampling by the hole on the pallet 04.After dropping to predetermined altitude, magnet 18 is pressed close to Hall magnetic switch 22 down, just stops operating after B group motor 16 is received signal, and the B electrode begins to enter the detection-phase (as shown in Figure 5) of awaiting orders.Through certain hour, treat signal stabilization after, under computer instruction, reason A electrode 03 provides detection signal just to automatically switch to by B electrode 25 and provides.Like this, detection signal does not interrupt, and reaches the purpose of continous-stable.Subsequently, A group motor begins to start, the drive tooth bar rises, A electrode 03, last downcomer and Turn-round slide plate also rise, spiral chute on slide plate also drives and turns to the fork rising and turned left 45 °, direction control lever 05 has also been turned left 45 °, keeps off sour plate 29 and spray acid and chews 28 and also turn over 45 ° and align A electrode (as shown in Figure 6).When rising to predetermined height, when magnet is pressed close to go up the magnetic Hall switch, computer just instructs A group motor to stop operating, and instruct sour pump to start simultaneously, acid solution with certain pressure is from the center pit of acid inlet 24 through acid inlet tube 06 approach axis control lever 05 hypomere, again through keeping off the center pit of sour plate, chew 28 and eject the A electrode is cleaned (as shown in Figure 7) from spraying acid at last.

Through behind the certain hour, computer instruction A group motor starts, and the A electrode puts in sampling groove 02 detection-phase of awaiting orders by the hole on the pallet 04 downwards, just automatically switches to computer behind the signal stabilization and handles.Then, computer instructs B group motor 16 to start again, once more B group electrode is carried out cleaning process.Like this, detect and clean and constantly carry out with regard to replacing mutually, circulate by A electrode and B electrode respectively, detection signal is stablized continuously, precision also improves greatly, for the accuracy and the reliability of the on-line automatic control of pH value provides technique guarantee, it is discontinuous to have overcome the single glass electrode detection signal of present domestic use fully, automatically the shortcoming of control accuracy and poor reliability.

Claims (4)

1, two glass electrode pH value automatic detection devices is characterized in that: this device is made up of two groups of electrodes of A, B, and be connected with fixed head 12 form on the support 20 of mainframe box 21 as a whole.

2, device according to claim 1 is characterized in that: every group of electrode is made up of motor 16, pinion wheel 15, tooth bar 13, last downcomer 19 and electrode 25 etc. respectively.

3, device according to claim 2 is characterized in that: every group of electrode drives electrode by underdrive on gear, the tooth bar and moves up and down.And by its stroke up and down of last magnetic Hall switch 17, magnetic Hall switch 22 and magnet 18 controls; With sour plate 29 of 08 control retaining of the spiral chute on fork on the direction control lever 05 07 and the Turn-round slide plate 09 and the sour direction of chewing 28 pairs of positive electrodes of spray.And block on the pallet 04 hole of being opened up and down for electrode with the sour plate of retaining; To prevent that acid solution from down flowing to sampling groove 02.

4, device according to claim 3 is characterized in that: the center drilling of acid inlet tube below 06 on the direction control lever 05, and the center pit of the sour plate 29 of connection retaining chews 28 to spraying acid; Form the cavity of a sealing with pallet 04, glass protecting cover 23 and mainframe box 21, in case the acid solution when cleaning is toward external leakage.

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