CN211478197U

CN211478197U - Spiral micro-drop measuring quantitative liquid device

Info

Publication number: CN211478197U
Application number: CN201921878328.8U
Authority: CN
Inventors: 浦天皓; 房博
Original assignee: Suzhou Weishao Measuring Instrument Co ltd
Current assignee: Suzhou Jiufa Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2019-10-26
Filing date: 2019-10-26
Publication date: 2020-09-11
Anticipated expiration: 2029-10-26

Abstract

The utility model provides a spiral micrometer buret ration knockout, install controller and graduated flask on the chassis, chassis left side fixed bolster, the fixed short horizontal pole in support lower part, fixed step motor on the short horizontal pole, step motor's epaxial fixed shaft coupling, spiral micrometer caliper scale is connected at the shaft coupling top, long horizontal pole is passed on spiral micrometer caliper scale upper portion, long horizontal pole left end is fixed on support upper portion, the fixed spiral micrometer on support upper portion, spiral micrometer caliper scale has been put to spiral micrometer caliper scale lower part, spiral micrometer caliper measuring rod is connected at spiral micrometer caliper scale top, piston push rod is connected at spiral micrometer caliper measuring rod top, the cover has the pressure spring on the piston push rod, the fixed block bottom is connected on the pressure spring top, piston push rod upper portion is passed the fixed block and is installed in the cylinder, the tubule is connected on the cylinder top, the tubule passes overlength horizontal pole right-hand. The device can be used in a chemical experiment with high standard precision, the precision of the device is 0.001ml, and is ten times higher than that of a micro computer titrator, namely, the precision of the device is 0.01 ml.

Description

Spiral micro-drop measuring quantitative liquid device

Technical Field

The invention relates to a spiral micro-drop quantitative liquid dispenser, in particular to a spiral micro-drop quantitative liquid dispenser which adopts a stepping motor to drive a spiral micro-meter to rotate, the spiral micro-meter pushes a piston in a needle cylinder to move, and the piston is accurately controlled to move so as to control the dropping liquid amount of the needle cylinder.

Background

At present, a burette is adopted in an acid-base neutralization titration experiment in a chemical experiment, the titration of a liquid reagent is carried out by using the burette, the liquid surface is concave due to the surface tension, the accurate reading is difficult to be observed by eyes, and the accuracy of the burette is not high and is only 0.1 ml. Similarly, measuring cylinders and measuring cups for measuring liquids have the problem of poor accuracy. The micro computer titrator made by micro peristaltic pump and precise metering sensor has complex structure and high price, and can only reach 0.01ml due to the limitation of the highest precision of the metering sensor. Therefore, the precision of the high standard can not be achieved in the precise experiment.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a spiral micro-measuring quantitative liquid dispenser which adopts a stepping motor to drive a spiral micro-meter to rotate, the spiral micro-meter pushes a piston in a needle cylinder to move, and the piston is accurately controlled to move so as to control the amount of liquid dripped from the needle cylinder.

The technical scheme adopted by the invention for solving the technical problems is as follows: a spiral micro-measuring quantitative liquid dispenser comprises a chassis, a controller and a measuring cup, wherein the controller and the measuring cup are installed on the chassis, a control button is arranged on the controller, a bracket is fixed on the left side of the chassis, a short cross rod is fixed on the lower portion of the bracket, a stepping motor is fixed on the short cross rod, a shaft of the stepping motor is fixed on a shaft, a spiral micro-measuring scale is connected to the top of the shaft, a long cross rod penetrates through the upper portion of the spiral micro-measuring scale, the left end of the long cross rod is fixed on the upper portion of the bracket, a spiral micro-measuring device is fixed on the upper portion of the bracket, a fixing block is fixed on the top of the bracket, a fixing screw is arranged on the fixing block, a fixing block is fixedly connected to the upper portion of the spiral micro-measuring device, a spiral micro-measuring scale is arranged on the lower portion of the spiral micro-measuring device, the top of the, the upper part of the piston push rod penetrates through the fixing block and is installed in the needle cylinder, the top end of the needle cylinder is connected with the thin tube, the thin tube is sleeved with the sleeve, the bottom of the sleeve is fixed at the right end of the long transverse rod, the thin tube penetrates through the right end of the long transverse rod, and the bottom end of the thin tube is provided with a drip opening.

The device has the beneficial effects that the device can be used in a high-standard precision chemical experiment, the device is actually used, the smallest point of water on a balance tray is actually measured, the weight is 1mg, namely 0.001ml, the precision of the device is 0.001ml, and the precision is ten times higher than that of a micro computer titrator, namely 0.01 ml.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a block diagram of a first embodiment of the present invention.

Fig. 2 is a structure diagram of transferring the nylon filament micro-droplets according to the first embodiment of the present invention.

In the figure: 1. the automatic measuring device comprises a chassis, a controller, a control button, a measuring cup, a stepping motor, a short cross rod, a support, a long cross rod, a screw micrometer, a fixing block, a fixing screw, a needle cylinder, a thin tube, a sleeve, a pressure spring, a piston push rod, a screw micrometer measuring rod, a drip opening, a screw micrometer scale, a coupling, a nylon wire and a bracelet, wherein the controller is 2, the control button is 3, the measuring cup is 4, the stepping motor is 5, the short cross rod is 6, the support is 7, the long cross rod is 8, the screw micrometer is 9, the fixing block is.

Detailed Description

In the embodiment shown in fig. 1, the device is provided with a chassis (1), a controller (2), a control button (3), a measuring cup (4), a stepping motor (5), a short cross rod (6), a support (7), a long cross rod (8), a micrometer screw (9), a fixing block (10), a fixing screw (11), a needle cylinder (12), a thin tube (13), a sleeve (14), a pressure spring (15), a piston push rod (16), a micrometer screw measuring rod (17), a drip (18), a micrometer screw scale (19), a coupler (20), nylon wires (21) and a hand ring (22).

The invention relates to a spiral micro-measuring quantitative liquid dispenser, which comprises a chassis (1), a controller (2) and a measuring cup (4), wherein the controller (2) and the measuring cup (4) are installed on the chassis (1), a control button (3) is arranged on the controller (2), a bracket (7) is fixed on the left side of the chassis (1), a short cross rod (6) is fixed on the lower part of the bracket (7), a stepping motor (5) is fixed on the short cross rod (6), a shaft coupling (20) is fixed on a shaft of the stepping motor (5), a spiral micro-measuring device scale (19) is connected with the top of the shaft coupling (20), a long cross rod (8) penetrates through the upper part of the spiral micro-measuring device scale (19), the left end of the long cross rod (8) is fixed on the upper part of the bracket (7), a spiral micro-measuring device (9) is fixed on the upper part of the bracket (7), a fixing block (10) is fixed on the top, spiral micrometer (9) upper portion fixed connection fixed block (10), spiral micrometer (9) lower part has been put spiral micrometer scale (19), spiral micrometer measuring stick (17) is connected at spiral micrometer scale (19) top, piston push rod (16) is connected at spiral micrometer measuring stick (17) top, the cover has pressure spring (15) on piston push rod (16), fixed block (10) bottom is connected on pressure spring (15) top, piston push rod (16) upper portion is passed fixed block (10) and is installed in cylinder (12), tubule (13) is connected on cylinder (12) top, the cover has sleeve pipe (14) on tubule (13), sleeve pipe (14) bottom is fixed at long horizontal pole (8) right-hand member, tubule (13) pass long horizontal pole (8) right-hand member, drip mouth (18) have been put to tubule (13) bottom.

According to the spiral micro-drop measuring quantitative liquid dispenser, the stepping motor (5) is electrically connected with the controller (2), and the controller (2) is electrically connected with the stabilized voltage power supply or the direct-current storage battery. The micrometer screw (9) is a micrometer screw, and the measurement precision of the micrometer screw (9) is at least accurate to more than 0.01 mm. The upper end of the micrometer screw gauge (9) is fixedly provided with a needle cylinder (12), a pressure spring (15) is arranged between a piston push rod (16) and a cylinder body in the needle cylinder (12), and the tail end of the piston push rod (16) is propped against a micrometer screw gauge measuring rod (17).

According to the spiral micro-measuring and quantitative liquid dropper disclosed by the invention, the dropping opening (18) is connected with the nylon wire (21), the top end of the nylon wire (21) is fixed with the bracelet (22), and the bottom end of the nylon wire (21) is connected with the bottom of the measuring cup (4). The support (7) is a telescopic support formed by two vertical rods, and the telescopic height can be adjusted after the two vertical rods are unscrewed. The needle cylinder (12) is made of quartz glass, and the piston push rod (16) is made of polytetrafluoroethylene plastic, so that metering errors caused by factors such as material deformation and corrosion can be avoided.

The invention relates to a spiral micro-measuring quantitative liquid drop device, which is characterized by comprising the following manufacturing points: the cross-sectional area of the inner wall of the syringe is uniform, and the displacement of the piston in the syringe determines the volume of the injected liquid. The micrometer screw in the device, namely the micrometer screw, can be accurate to 0.01mm, and the micrometer screw is used for accurately pushing the piston of the needle cylinder so as to accurately drip liquid. This device has just binded a cylinder on the micrometer caliper, and the structure is: the fixed end of the screw micrometer is provided with a needle cylinder, a spring is arranged between a piston push rod and a cylinder body of the needle cylinder, and the tail end of the piston push rod is propped against the screwAnd the micrometer is arranged on the telescopic measuring column. The structure principle is as follows: when the micrometer screw is rotated, the piston rod is pushed forward, and the liquid in the syringe can be quantitatively dripped out. With an internal cross-section of 1cm diameter²The syringe can be used for quantitatively dripping one thousandth of milliliter every time the piston advances by 0.01 mm.

The invention relates to a spiral micro-measuring quantitative liquid dispenser, which has the innovative points that:

1. the screw micrometer is used to push the needle cylinder and precisely control the movement of the piston to control the amount of liquid dropped.

2. The measuring column of the spiral micrometer and the syringe push rod are in top contact transmission, so that the measuring column and the syringe push rod are kept in close contact under the action of the elastic force of the spring, no gap influence exists, and accurate connection is guaranteed.

3. A coupler between the stepping motor and the micrometer screw is rotated and slid in a long groove by a pin, and similarly, the problem that a micrometer screw measuring column needs to stretch when rotating is solved by rotating the pin by a finger.

4. The problem that fine liquid drops cannot drop naturally due to surface tension is solved by a nylon wire liquid transferring method.

According to the spiral micro-measuring quantitative liquid dispenser, the liquid dripped by the original glass burette is about 0.01ml due to different liquid surface tension coefficients, and the dripped liquid of the high-precision burette with the smallest caliber is dripped. The device can be accurate to 0.001ml, so that 1/10 drops can be formed, and the drops cannot be naturally dropped. In order to solve the problem, the device uses a nylon fishing line to carry out micro-droplet transfer, namely a small section of nylon line is used for dipping 1/10 droplets of liquid, and then the liquid is transferred into a titration container such as a measuring cup, a conical flask, a beaker and the like.

The problem of the maximum volume of the spiral micro-measuring liquid quantifying device is that the volume of the syringe is limited, and 3ml can be dripped into the syringe at the maximum volume each time. The device adopts the motor to drive the micrometer caliper, so that the device can conveniently and quickly rotate reversely to extract the liquid reagent to enter the needle cylinder and then continue to titrate, so that the liquid is repeatedly added, and the maximum metering value can be infinitely enlarged. The motor is arranged on an iron stand and is connected with the micrometer screw by a movable coupling. When the hand-held operation is needed, the micrometer screw and the syringe can be partially detached. Thus, the invention can be used as a measuring cylinder besides the titration function, and can realize high-precision measurement.

The precision of the spiral micro-measuring quantitative liquid dispenser is tested as follows: with an analytical balance, the accuracy reached 0.001ml, conclusion: the precision of the device is 0.001ml, which is ten times higher than that of the micro computer titrator 0.01 ml. Experimental methods and procedures: a comparative test was performed with pure distilled water, and the smallest spot of water on the balance tray weighed 1mg, which was 0.001 ml. Through detection, the device can accurately measure 0.001ml, and the error is less than +/-5%.

According to the spiral micro-measuring quantitative liquid drop device, the needle cylinder is made of quartz glass, the piston is made of polytetrafluoroethylene plastic, and metering errors caused by material deformation, corrosion and other factors are avoided. The screw micrometer and the needle cylinder of the device can be made longer, and the current screw micrometer has a stroke of only 25mm so as to improve the one-time titration amount. The needle of the device should be made of plastic to prevent reaction with the reagent.

The invention relates to a spiral micrometer drop quantitative liquid dispenser which adopts the principle of fine shrinkage, wherein a needle cylinder is arranged at the fixed end of a spiral micrometer, a spring is arranged between a piston push rod and a cylinder body of the needle cylinder, and the tail end of the piston push rod is propped against a telescopic measuring column of the spiral micrometer. It uses spiral micrometer to accurately push the piston of needle cylinder, and makes the liquid accurately drip out, and can be accurately up to 0.001 ml.

The device can be used in a chemical experiment with high standard precision, the device is actually used, the smallest point of water on a balance tray is actually measured, the weight is 1mg, namely 0.001ml, the precision of the device is 0.001ml, and the precision is improved by ten times compared with the precision of 0.01ml of a microcomputer titrator.

The invention has good effect.

Claims

1. A spiral micrometer quantitative liquid dispenser comprises a chassis (1), a controller (2) and a measuring cup (4), and is characterized in that the controller (2) and the measuring cup (4) are installed on the chassis (1), a control button (3) is arranged on the controller (2), a bracket (7) is fixed on the left side of the chassis (1), a short cross rod (6) is fixed on the lower portion of the bracket (7), a stepping motor (5) is fixed on the short cross rod (6), a coupler (20) is fixed on a shaft of the stepping motor (5), a spiral micrometer scale (19) is connected with the top of the coupler (20), a long cross rod (8) penetrates through the upper portion of the spiral micrometer scale (19), the left end of the long cross rod (8) is fixed on the upper portion of the bracket (7), a spiral micrometer (9) is fixed on the upper portion of the bracket (7), a fixing block (10) is fixed on the top of the bracket (7), and a fixing screw (11) is arranged, spiral micrometer (9) upper portion fixed connection fixed block (10), spiral micrometer (9) lower part has been put spiral micrometer scale (19), spiral micrometer measuring stick (17) is connected at spiral micrometer scale (19) top, piston push rod (16) is connected at spiral micrometer measuring stick (17) top, the cover has pressure spring (15) on piston push rod (16), fixed block (10) bottom is connected on pressure spring (15) top, piston push rod (16) upper portion is passed fixed block (10) and is installed in cylinder (12), tubule (13) is connected on cylinder (12) top, the cover has sleeve pipe (14) on tubule (13), sleeve pipe (14) bottom is fixed at long horizontal pole (8) right-hand member, tubule (13) pass long horizontal pole (8) right-hand member, drip mouth (18) have been put to tubule (13) bottom.

2. A spiral measure micro-drip dispenser according to claim 1, wherein the stepping motor (5) is electrically connected to the controller (2), and the controller (2) is electrically connected to a regulated power supply or a dc battery.

3. The liquid spirometer according to claim 1, characterized in that the said spirometer (9) is a spirometer, and the measurement accuracy of the spirometer (9) is at least 0.01 mm.

4. The spiral micrometer quantitative liquid dispenser according to claim 1, wherein the upper end of the spiral micrometer (9) is fixedly provided with a syringe (12), a pressure spring (15) is arranged between a piston push rod (16) and a syringe body in the syringe (12), and the tail end of the piston push rod (16) is pressed against the measuring rod (17) of the spiral micrometer.

5. The spiral micro-metering quantitative liquid dispenser as claimed in claim 1, wherein the drop opening (18) is connected with a nylon wire (21), a bracelet (22) is fixed at the top end of the nylon wire (21), and the bottom end of the nylon wire (21) is connected with the bottom of the measuring cup (4).

6. The screw micrometer burette of claim 1 wherein the support (7) is a telescopic support formed by two vertical rods, and the height of the telescopic support can be adjusted by loosening two screws.

7. The screw micrometer burette of claim 1 wherein said barrel (12) is formed of quartz glass and said plunger rod (16) is formed of teflon.