SU1703979A1 - Liquid dosage measuring unit - Google Patents

Abstract

The invention relates to an analytical technique, namely to multi-channel liquid dosing devices, and can be used in agriculture for soil and feed analysis, medicine. biology, food, chemical, petrochemical industry, etc. The invention allows to increase the efficiency of dosing due to independent regulation of doses to the dosing cylinders.

Description

ate

with

Xi

o soy xj yu

pax. The dispenser contains a flow switch control unit 1 having a switching body 2, 3 flow switches having levers L for switching the fluid flow points to a similar or output line, signaling devices 5 and G switch positions, metering cylinders 7 with rods 8, on which the pistons 9 are fixed, the node 10 is the reciprocating movement of the rod of the metering cylinders. The node 10 has a projection platform 11 with a protrusion 12 that has the ability to move about the groove 13. A propeller 14 is rigidly attached to the platform 11. The other end of the oint 14 is inserted into the thread. The invention relates to an analytical technique, namely to multi-channel liquid dispensing devices, and can be used agriculture for the analysis of soils and feed, food, chemical, oil refining industry, medicine, biology, wherever analysis of samples is necessary, to obtain aliquots.

A known automatic burette metering device containing a drive screw, a metering device, a distribution valve, a titrant consumption indicator made in the form of an optical pulse system including a shutter disc placed on the drive driving screw, a radiation source and a light-receiving PCA. - a setting device and an electronic pulse counter, the input of which is connected to the output of the light-receiver, and the output is connected to the input of the software-setting device associated with the drive.

The specified device works as follows. The movement of the metering piston is associated with the movement of the pulser. A certain portion of fluid corresponds to a certain number of electrical impulses and by setting the desired volume of liquid in advance, you can measure the required amount of fluid by the number of pulses.

The specified device has the following disadvantage. The dosing of the liquid in it occurs in one channel, which reduces the performance of chemical analysis systems that use this device.

a bushing sleeve 15 provided with a gear wheel 16. The dispenser also includes a reversible electric motor 17, on the axis of which a gear wheel 18 is fixed. a cog wheel 15, a dose measuring unit 19 consisting of an orifice disk 20 (pulsator), on either side of which an illuminator 21 and a photosensitive element 22, a photocurrent amplifier 23 and a reversing counter 24 pulses, a dose setting unit 25, whose output is connected to the first input of the coincidence unit 26, the motor control unit 27, the prohibition unit 28 and the resolution unit 29. 8 il.

Closest to the proposed invention is a multichannel metering device comprising an electric motor, an electric motor control device, an electric pulse counting device, respectively, a dosing volume, a data input device, a coincidence unit, a device for moving rods (pistons) of metering devices, metering devices and an outflow switching unit and fluid intake.

The specified device works as follows. Using an input device, a device for counting electric pulses of metered volumes and a coincidence unit, the motor is switched on through its control device in one of two directions. The switch-on is carried out for the time required to take or dispense the required volumes of liquid simultaneously in all channels. The selection or dosing is done by moving the pistons of the dispensing devices of the syringe type with the help of a moving device. At the same time, the liquid through the valve simultaneously enters the cylinders of all the dosing devices or is expelled from them.

The disadvantage of this device is the following. The number of portions of the liquid to be measured through all the channels of the dose metering is the same, which narrows the scope of use of the dispenser.

The purpose of the invention is to increase efficiency by independently adjusting the doses in the metering cylinders.

The goal is achieved by the fact that, in a liquid dispenser containing dispensing cylinders, the working cavities are each communicated through the flow switch to the entrance and the output lines, the pistons are located at the cylinders, and the rods are connected to the node connected to the device. -accessive movement, equipped with a reversible electric motor and a dose measuring unit, which appears as a pulsator connected to a pulse counter, the output of which is connected to the first input of the coincidence unit, The second input of which is connected to the setpoint of doses, the Start button, the prohibition block and the resolution block are entered, and the flow switches are equipped with a switch position for them, made as a switch body connected to the control unit and a switch position indicator, the first input of the control unit is connected to the output of the coincidence block, which is simultaneously connected to the first input of the prohibition block, the outputs of the position switches of the switches are connected to the first and second inputs of the resolution block, the third input of which It is connected to the first output of the prohibition block, the second output of the cathob is connected to the first input of the control device, to the second input of which the first output of the permission block is connected, the second output of which is connected to the second input of the prohibition block, the second input of the control unit and the fourth input of the permission block are connected to Start button.

The introduction of a flow switch, a position indicator, a block and a permission block makes it possible to use a liquid dispenser in multichannel analyzers with independent regulation of doses and n dispensing cylinders.

The flow switch control unit allows you to automatically stop dispensing when a certain program is executed (when certain quantities of liquid are dispensed). This makes it possible to ensure the parallel operation of several devices for analysis (several photometers, ionomers, titrometric systems, etc.).

The position switches of the flow switch, the inhibit and permit blocks allow interrupting and restoring the cycle of the dosing cylinder as the program runs in the individual dosing cylinders, excluding accidental operation of the dosing mechanisms, i.e. allows you to fully automate the process of dispensing fluid.

I la of FIG. 1 shows the structure of the fluid flow; from flash 2 - switching on and control of a reversible electric motor; pas figs. 3 is a graph of the elinism of the dispensed volume of liquid in the dispensed cylinders against time; in fig. L - block diagram of the sn; doses, USP coincidence and block prohibition; in fig. 5 is a block diagram of the control unit of the reversible electric motor, the flow switch control unit and the position switches of the flow switches; in fig. 6 - bpoc-schema block resolution; in fig. 7 and 8 is a block diagram of a single element.

5 flow switch control units.

The fluid dispenser contains (Fig. 1) a flow switch control unit 1, having a switching body 2, 3 flow switches having 4 levers for switching the direction of the liquid flow, 5 switches and 6 position switches, dosing cylinders 7

5 by the rods 8, on which the pistons 9 are fixed, of the node 10 of reciprocating movement of the rods of the metering cylinders, consisting of a platform 11 with a protrusion 12. which has the ability to move in

0 groove 13. A spindle 14 is rigidly attached to the platform 11. The screw 14 is inserted at the other end into a threaded bushing 15 equipped with a gear wheel 16. The dispenser also contains a reversible electric motor

5 to 17, on the axis of which a gear wheel 18 is attached. Engaged with a gear wheel 16, there is a dose measurement unit consisting of an orifice disk 20 (impulse). on both sides of which

0, the illuminator 21 and the photosensitive element 22, the photocurrent amplifier 23 and the reversible counter of electric pulses 24, the dose setter 25, the output of which is connected to the first input of the drop-down unit 26, the motor control unit -27, the prohibition 28, the first input of which is connected to the output of the coincidence device 26 and simultaneously to the input of the flow switch control unit 1, and

0, the second output is connected to the first input of the motor control unit 27, the first and second inputs of which are connected to the signaling devices 5 and the position of the switches, the third input is connected to the first output of the prohibition unit 28, and a start signal is applied to the fourth input. The first exit of the permission unit 29 is connected to the second input of the motor control unit 27, and the second output is connected to the second input of the prohibition unit 28.

Liquid dispenser and rlbogot following

IMAGE.

Using the 2) dose setting (Fig. 1), the required dose values of all the metering cylinders 7 are fixed. By the flycK (SP) signal by the control unit 1, the lever 4 translates to the position of Gh, which ensures liquid intake from a to c, then from the signals of the switch position indicator 5, the control unit 27 starts operating through the resolution unit 29, including the electric motor 17. The process of collecting the liquid begins (the vessel with the liquid is located at the inlet a). At the same time, from the reducer - gear wheel 18 of the electric motor 17, the threaded sleeve 15 of the node 10 of the reciprocating movement of the rods begins to rotate with the gear wheel 1G, screwing in the driving screw 14, which moves the platform 11, with the rods 0 and pistons 9 fixed on it, in the direction of L The projection 12, which moves in the groove 13, interferes with the rotation of the platform 11. The liquid enters each of the metering cylinders 7 through the corresponding flow switch. When filling metering cylinders. 7, by a liquid corresponding to the maximum possible predetermined dose, according to the signal of the coincidence unit 20, the prohibition unit 28 is turned on, or the signal of which is turned on by the motor control unit 27 17, and the latter is inhibited. The signal of the coincidence unit 26 operates the flow control switch unit 1, transfer their levers 4 to another extreme position P2, the resolution unit 29 works again, turning the electric motor 17 into reverse through the motor control unit 27 17, which moves the platform 11 attached to It stocks 8 in direction A2. Now the liquid from the metering cylinders 7 through the flow switch enters the volumes (vessels) 30 (Fig. 5) for the sample from c to b. The volume of fluid being metered is fixed by an electric pulse counter 24, and as soon as it reaches the minimum predetermined dose fixed in the dose setter 25, a coincidence unit 26 operates, from which the electric motor 17 is disconnected through blocks 28 and 27, and the control unit 1 switches the flow switch of that metering cylinder 7, which measured the first required dose, to the initial position, and the liquid left in this metering cylinder 7 returns to the vessel from which it was taken, i.e. the movement of fluid in this cylinder will occur or c to a. In the remaining dosing cylinders 7, the process of dosing proceeds from the signal of the resolution unit 29. And so on as the dosage program is completed.

the motor 17 is periodically decelerated from the signal of the coincidence unit 26 and the operation of the flow switch control unit 1, the latter moving to the initial position P1, excluding the overflow

fluid.

Changing the direction of rotation of the electric motor 17 (Fig. 2) and the electric motor 31 of the control unit 1 is made by changing the phase on the control winding

Li with the same polarity of the inclusions of the excitation winding L2, i.e. when fed to the winding LI of the F1 phase, the engine measles rotates in one direction, and when fed to the same winding of the Phi phase, it changes

direction of rotation. In this case, the desired phase is supplied to the same end of the motor winding, and the second end of this winding is connected to the zero output of the power source, for example to the middle

the output of the secondary winding of the transformer Tr. Thus, the electric motors 17 (31) will rotate in both directions in accordance with the signals of high-voltage signals applied to the diode control electrode

UDz through the inputs S1 or 41 of the electric motor 17 and 11 or 21 of the electric motor 31.

In the timeline (Fig. 3), the amount of liquid dispensed by nodal points (metering cylinders) is measured on the ordinate axis, and the dosing time is measured on the abscissa axis. So. in the first cylinder the volume of the dosed fluid W0. in the second cylinder - Wt, in the 111 cylinder Wa, etc., in the 1st cylinder Wi, while

W0 Wi Wz ... Wi.

Dosing begins simultaneously in all metering cylinders. When in

When the cylinders are filled, the volume of the liquid to be dosed will reach the value W0 (point c). I the cylinder overlaps with the appropriate flow switch and the remaining time of the device W0 const. Next in pseh

other cylinders except 1. where Wo const, dosing goes to the value of Wi (point t2), and when reaching the corresponding switch of the 3 flows, the second cylinder is crossed, the second

Wi const, dosing is continued in all cylinders except I and II. up to the value of L / 2 (point xs), is blocked by the corresponding switch of the streams III channel and W2 in it remains constant. Etc. up to the value of Wi (point ti), which corresponds to the volume of liquid dispensed by the By-channel.

Zedatchik doz (Fig. -1) contains switches PP1, PP2, .... PP |, by which the required doses of fluid are set. The number of switches is determined by the number of metering cylinders 7.

The number of Olocoe YCi, US2. .... CSS | In block 26, the coincidence block 26 is also determined by the number of metering cylinders 7. At the first inputs of the Oloko Al, Az. .. ,, AI are given the prescribed dose values (A), and ng the second inputs from the counter 24 pulses of the dose measurement unit 19, the values (B) corresponding to the dosage volumes. A prohibition block 28 is connected to the output of the coincidence unit 26, which is connected in parallel via diodes Di, D2. .... DI pulses issuing units BVI1, BVI2, ..., BVI |, each of which consists of BI inverter, RQ elements. Do, Co, BS coincidence block and RL resistance

Prior to the start of operation of the device, on all outputs of block 26 coincidence Ai, g ..., 2 ... | the potential is equal to zero, and at the output of the BI inverter the potential is equal to a logical one and through R0. Do charge capacitor C0. When the output of the counter 24 pulses reaches a value equal to the given dose AI,, the output of the corresponding condition | the potential becomes equal to a logical unit, the potential at the input of the BI inverter is equal to one, and the output of the BI is a logical zero, the capacitor C is discharged through one of the diodes D to the resistance RI and to the input of the prohibition unit 28 a prohibition signal is given. Time of discharge So, i.e.; the pulse duration at the output of block 28 of the ban (RI + RBC) CO, where RBC is the internal resistance of the coincidence unit (BS),

When the output of the counter 24 pulses reaches a value equal to the next predetermined dose at the output of the prohibition unit 28, the prohibition signal will again appear, etc. for the entire operation of the device.

The motor control unit 27 and the switch control unit 1 contain identical blocks BUD1, BU02. БУОЗ, БУ04 (Fig. 5), which provide for the change of the phase (Ui) on the control winding of the electric motor 17, which include controlled diodes EO1, EO2, OOS, diodes Di, D2, Oz. Oz RO resistance.

resolution block 29 (Fig. 6) contains triggers Ti, T2, Tz, BIT inversion blocks, BI2, BSt, BS2 coincidence blocks, BVI BVI2 impulse output blocks, De, O and resistor R2 diodes, Inputs BU01, BU02, are connected to outputs matching blocks

GCi and BS2 resolution block 29. The first inputs BCi and BS2 are connected to the outputs of the triggers TI, T2 of resolution block 29 through inversion blocks BHi, Outputs of the signal edge or 5 of congestion 5, and the position of flow switches are connected to the first input of trigger Tz of resolution block 29 through pulse blocks BVI BVI 2 and diodes Oh and Oh respectively. Simultaneous exit

0 signaling device 5 is connected to the second input of tr :(: Era TI, and the output of the signaling device 6 is fed to the second input of the T2 trigger. The second input of the Tz trigger is connected to the first input of the Tz trigger. To the first input of the trigger

5 Ti through the diode 0e, the start signal (SP) is received, and the prohibition signal (C3) is sent to the first input of the T2 trigger.

When the joint venture arrives at the first input of the trigger Ti, the BUDZ is turned on, the control unit 1 is lazy with switches, which acts on the electric motor 31 and the switching body 2 switches the lever 4 of the switch 3 threads to the initial position. At the time of transition switch 3 threads

5 to its initial position is prepared for operation by the BVIT and after the detector of the 5 position of the flow switch triggers through the Do diode, the trigger Tz is triggered, activating the control unit 27 of the electric motor 17, the process of collecting the liquid from one of the vessels 30 is completed. T2 is triggered, including BUC-q switch control unit 1, and trigger Tz

5 is reset, the switch 3 flows according to the signal of the signaling device b of the position of the flow switch by lever 4 moves to another position, then BVI2, start Tz and BUD2 of the node are working. 27 is controlled by the electric motor 17 and the dosing process is in progress in one of the vessels 30. Following the execution of the first program of dosing from the SOC, T3 is reset and T2 is started up, etc. for the entire operation of the device.

5 The considered example of the operation of the circuit (Fig. 5 and b) is designed for the case when all the metering cylinders are equipped with flow switches having individual control, i.e. everyone has it

0 switch their signaling devices 5 and b of the position of the switches, as shown in FIG. 7

The switch control unit 1 with one motor 31 (FIGS. 7 and 8) co5 holds a series of control switches 3 streams, above the switching levers 4 of which moves from the engine 32 through the gear 33 disk 34, with a solenoid 35 fixed on it. On the axis the disk 35 is fixed and moves with it the code

; ln, to 37, which is enclosed by a fixedly mounted reading device 30. The descent of the drive 32 of the block 1 of the control unit / unit is connected to the device 39 of the control unit. and a counting output of the device 38 is connected to the first gate of the matching device 26. The second input of the coincidence device 26 receives signals from the rewinder 24 pulses. The input of the solenoid 35 through the amplifier 40 is connected to the output of the device 26 coincidence. The area of operation of the codec disk 37 with the reader 30 is located on the boundaries of the segmentoo SP, SGS, SGS. After the operation of block 20, the coincidence core 41 of the solenoid 35 retracts, switches the switching organ 2, which touches lever A of the switch 3, when the disk 34 moves, and therefore the code disk 37 translates it into one or the other Position P1 or P2, depending on the direction of movement of the disk 34. The switch of the 3 streams to the desired position each time is signaled by the signaling devices 5 and 6 of the position of the flow switch.

Claims (1)

Compared with the prototype, the present invention allows to exclude multiple (ambient weighing), it is possible to fill in the amount of liquid that is necessary to obtain the required volume of aliquot in all channels simultaneously. Formula of Invention Liquid dispenser containing metering cylinders, the working cavities of each of which are communicated through flow switch with input and output -o A tr # l "Y} l, g 3 # 53q 4i - / - 4-J Yag - $. tui.Z 0 five 0 0 five five mz; sources located in piston cylinders whose ipocs are connected to a reciprocating unit connected to the control unit; Pel movement provided with a reversible electric motor and a dose measuring unit made in the form of pulsers connected to a pulse counter whose output is connected to the first input. a match unit, the second input of which is connected to a dose setting unit, characterized in that. In order to increase efficiency due to independent regulation of doses in the metering cylinders, the Start button, the inhibit unit and the resolution unit are entered into it, and the flow switches are equipped with a switching unit for their position, made in the form of a switching organ associated with the control unit and the position switches of the switches; the first input of the control unit is connected to the output of the coincidence unit, which is simultaneously connected to the first input of the prohibition unit, the outputs of the position switches of the switches are connected to the first and second inputs of the permission unit, the third input of which is connected to the first output of the prohibition unit, the second output of which is connected to the first input control device, to the second input of which the first output of the resolution unit is connected, the second output of which is connected to the second input of the inhibit unit, and the second input of the control unit And the fourth input of resolution blocks are connected to the Start button. Sfrl PDA I „f, i.iL„ 1t / S /// ///// U, /// SS // S / A. t ka t channel i ± kaf / aj  rut i. k0n (, -You ("IHOJ 21 t / g. i 2 € h BI . BVNg, i th l I. ic f Signal janftme fr L-.i i-J / g / pfp h / 7 L9 L J J 6 L (} CO Z. I fig.c J6