CN212059020U

CN212059020U - Evaporation error reducing device for calibrating capacity of pipettor

Info

Publication number: CN212059020U
Application number: CN202021193648.2U
Authority: CN
Inventors: 阮社; 苗苗; 陈焕焕; 陈升瑞; 李文甲; 李芳红
Original assignee: Shandong Special Inspection & Measurement Co ltd
Current assignee: Shandong Special Inspection & Measurement Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-12-01
Anticipated expiration: 2030-06-24

Abstract

The invention discloses a device for reducing evaporation errors for calibrating the capacity of a pipettor. According to the invention, a liquid feeding hole is formed in a cup cover, a sealing cover is arranged above the liquid feeding hole, the top of the sealing cover is connected with the end part of a telescopic rod of an electric push rod through a connecting piece, the electric push rod is fixed on the cup cover, a driving motor of the electric push rod is electrically connected with the output end of a motor controller, a button battery pack and a wireless receiver are arranged at the upper end of the driving motor, and the wireless receiver is electrically connected with the input end of the motor controller; a remote control system is also included. The device furthest reduces the evaporation error, effectively solves the problem of large evaporation capacity of the detection liquid in the process of calibrating the capacity of the liquid transfer device, and fills the blank in rows.

Description

Evaporation error reducing device for calibrating capacity of pipettor

Technical Field

The invention belongs to the technical field of metrological verification, and particularly relates to an evaporation error reducing device for verifying the capacity of a pipettor.

Background

In the prior art, a weighing method is adopted for calibrating the capacity of a pipettor, in the process of calibrating the pipettor, workers weigh the mass of a measuring cup with a cup cover which is dried in advance and is synchronously constant in temperature by using an electronic balance, then transfer pure water in the pipettor into the measuring cup with the cup cover according to the regulation operation, weigh the total mass of the measuring cup with the cup cover after adding the pure water by using the electronic balance, and obtain the capacity error of the pipettor through calculation. Because the capacity of the pipettor is usually measured by mu L, and the mass is calculated by 0.001mg, therefore, air evaporation brings great errors, even if the sealing property of the measuring cup with the cup cover is ensured to be completely qualified, the cup cover must be lifted in the liquid transfer process, a spray gun nozzle of the pipettor contacts the inner wall of the measuring cup and inclines for a certain angle to inject pure water, and then the cup cover is covered, and a certain time is needed for injecting the pure water after the mouth of the measuring cup is greatly opened, so that the pure water evaporation errors are increased. How to reduce the evaporation error to the maximum extent does not have an effective device at present, and therefore, the company develops an evaporation error reducing device for calibrating the volume of a pipettor.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a device for reducing evaporation errors for calibrating pipette capacity.

The technical scheme of the invention is as follows:

an evaporation error reducing device for calibrating capacity of a pipettor comprises an electronic balance and a measuring cup with a cup cover, wherein the measuring cup with the cup cover comprises a measuring cup and a cup cover, the upper end of the measuring cup is detachably and hermetically connected with the cup cover, a liquid feeding hole is formed in the cup cover, a sealing cover capable of sealing the liquid feeding hole is arranged above the liquid feeding hole, the top of the sealing cover is fixedly connected with the end part of a telescopic rod of an electric push rod through a connecting piece, the electric push rod is fixed on the cup cover, a driving motor of the electric push rod is electrically connected with the output end of a motor controller fixed at the upper end of the driving motor, a button battery pack and a wireless receiver are fixedly arranged at the upper end of the driving motor, the button battery pack provides electric energy for the driving motor, the motor controller and the wireless; the remote control system is in signal connection with the wireless receiver.

Preferably, the electronic balance further comprises a workbench, and the electronic balance is placed on the workbench.

Preferably, the remote control system is the remote controller, the casing internal fixation of remote controller is equipped with microprocessor and dry battery, fixed start button, reset button and the wireless transmitter of being equipped with on the casing, the dry battery provides the electric energy for microprocessor, start button, reset button and wireless transmitter, start button, reset button all are connected with microprocessor's input electricity, wireless transmitter is connected to microprocessor's output electricity, wireless transmitter signal connection wireless receiver, remote controller and wireless receiver's cooperation is used in this above-mentioned setting for thereby control driving motor's the positive and negative rotation reaches the extension of control electric putter well telescopic link and shortens work.

Preferably, the remote control system comprises a remote control shell, the remote control shell is fixed on the workbench through a support rod, a microprocessor and a dry battery are fixedly arranged in the remote control shell, a wireless transmitter is fixedly arranged on the remote control shell, and the height of the wireless transmitter is consistent with that of the wireless receiver; the wireless remote control device is characterized by further comprising a foot switch fixed on the ground, the dry battery provides electric energy for the microprocessor, the wireless transmitter and the foot switch, the foot switch is electrically connected with the input end of the microprocessor, and the wireless transmitter is in signal connection with the wireless receiver. The remote control system can facilitate the working personnel to control the extension and contraction actions of the telescopic rod of the electric push rod by controlling the foot switch by feet; the method specifically comprises the following steps: the working personnel step on the foot switch by feet, the foot switch can feed back signals to the microprocessor, the microprocessor controls the wireless transmitter to send signals to the wireless receiver, the wireless receiver can send the received signals to the motor controller after receiving the signals, the motor controller controls the driving motor of the electric push rod to work so that the telescopic rod of the electric push rod is shortened until the length of the telescopic rod reaches the minimum value, at the moment, the sealing cover is removed from the liquid adding hole, and the liquid adding hole is completely leaked; after the staff has added the pure water in using the pipettor to the graduated flask, the staff can step on foot switch again with the foot, foot switch can feed back the microprocessor with the signal once more, microprocessor control wireless transmitter sends the signal to wireless receiver, wireless receiver can give motor controller with received signal transmission after receiving the signal, motor controller control electric putter's driving motor work makes electric putter's telescopic link extension until telescopic link length reaches the maximum value, at this moment, the sealed lid with electric putter's telescopic link end connection covers the liquid feeding hole totally sealed, the setting of this above-mentioned remote control system can be convenient for the staff to vacate a hand.

Preferably, the liquid feeding hole includes trapezoidal through-hole, sets up at the left little arc hole of trapezoidal through-hole and sets up the big arc hole on trapezoidal through-hole right side, little arc hole is located the one side of keeping away from electric putter, just little arc hole is located the top of graduated flask inner wall. This above-mentioned setting is convenient for the staff with annotating on the liquid mouth of pipettor pastes the graduated flask inner wall and can follow graduated flask inner wall rebound, can make the pure water in the pipettor all add into the graduated flask effectively like this.

Preferably, the lower end surface roughness of the sealing cover is 0.05 microns or less. This above-mentioned setting up one can effectively reduce the frictional force between terminal surface and the bowl cover up end under the sealed lid, the relative bowl cover up end of sealed lid of being convenient for removes, and the roughness of terminal surface is more smooth on its surface for the less under sealed lid, and when sealed lid covered the liquid feeding hole, sealed lid was better to the leakproofness in liquid feeding hole.

Preferably, the edge of the lower end of the sealing cover is provided with a circular arc chamfer. The arrangement can facilitate the horizontal movement of the sealing cover.

Preferably, the connecting piece include with sealing cover top central point department fixed connection's U type ring, the opening of U type ring is down, the circular arc interpolation of U type ring has the horizontal axis, there is the gap between the circular arc medial surface of the upper end of horizontal axis and U type ring, both ends are fixed on the pedestal through circlip for the axle around the horizontal axis, the pedestal and electric putter's telescopic link tip fixed connection. In this above-mentioned setting, there is the gap between the circular arc medial surface of the upper end of horizontal axis and U type ring, and this gap can guarantee that sealed lid is perpendicular downwards all the time.

The invention has the beneficial effects that:

in the process of using the device to carry out capacity verification on the pipettor, the cup cover is not needed to be opened during liquid injection, and only the sealing cover is opened, so that the evaporation area of pure water is far smaller than the area of the mouth of the measuring cup as the area of the liquid adding hole; simultaneously, because the sealed lid that is used for sealing up the liquid feeding hole is electric control, this just makes the staff use the pipette to add the pure water to the inside back that has just made, the system can be fast, accurate, control electric putter steadily with sealed lid propelling movement to liquid feeding hole department in order to cover the liquid feeding hole sealed, compare in traditional operation, this application has effectively shortened the time that the pure water exposes in the air, has effectively reduced the pure water evaporation capacity, so, this application the device furthest reduce evaporation error, promoted examination quality and automation, effectively solved the big problem of pipettor volumetric verification in-process examination liquid evaporation capacity, filled in the row blank.

Drawings

Fig. 1 is a schematic structural view of a main sectional view according to a first embodiment of the present invention;

FIG. 2 is a schematic top view of the first embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is a schematic top view showing the structure of the present invention with the filling hole exposed according to the first embodiment;

FIG. 5 is a schematic diagram of a cross-sectional view of the pipette in accordance with one embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a remote controller according to a first embodiment;

FIG. 7 is a schematic structural view of a main sectional view according to a second embodiment of the present invention;

FIG. 8 is a schematic top view of the second embodiment of the present invention;

fig. 9 is a schematic top view showing the structure of the present invention in a state where the liquid filling hole is exposed according to the second embodiment;

FIG. 10 is a schematic structural diagram of a main sectional view of the pipette in accordance with the second embodiment of the present invention;

fig. 11 is a schematic structural diagram of a remote control system according to a second embodiment.

In the figure: 1. the working table comprises a working table, 2, an electronic balance, 3, a measuring cup, 4, a cup cover, 5, a telescopic rod, 6, a wireless receiver, 7, a button battery pack, 8, a motor controller, 9, a driving motor, 10, a bolt, 11, a remote controller, 12, a horizontal shaft, 13, a shaft elastic retainer ring, 14, a shaft bracket, 15, a U-shaped ring, 16, a sealing cover, 17, a gap, 18, a liquid adding hole, 19, an arc chamfer, 20, a measuring cup inner wall, 21, a liquid injection nozzle, 22, a liquid transfer device, 23, a large arc hole, 24, a small arc hole, 25, a trapezoidal through hole, 26, a wireless transmitter, 27, a shell, 28, a starting button, 29, a reset button, 30, a microprocessor, 31, a dry battery, 32, a remote control shell, 33, a supporting rod, 34 and a foot switch.

Detailed Description

The first embodiment is as follows:

as shown in fig. 1 to 6, an evaporation error reducing device for calibrating the capacity of a pipette comprises an electronic balance 2 and a measuring cup with a cup cover, wherein the electronic balance 2 is placed on a workbench 1, the measuring cup with the cup cover comprises a measuring cup 3 and a cup cover 4, the upper end of the measuring cup 3 is detachably and hermetically connected with the cup cover 4, a liquid adding hole 18 is formed in the cup cover 4, the liquid adding hole 18 comprises a trapezoidal through hole 25, a small arc-shaped hole 24 arranged on the left side of the trapezoidal through hole 25 and a large arc-shaped hole 23 arranged on the right side of the trapezoidal through hole 25, the small arc-shaped hole 24 is positioned on one side far away from an electric push rod, the small arc-shaped hole 24 is positioned above the inner wall of the measuring cup 3, the inner wall of the measuring cup 3 can be seen vertically downwards from the upper part of the small arc-shaped hole 24, the central line of the length direction of the liquid adding hole 18 passes through the center of the cup cover 4, the edge of the lower end of the sealing cover 16 is provided with an arc chamfer 19, the central position of the top of the sealing cover 16 is fixedly connected with a U-shaped ring 15 with a downward opening, a horizontal shaft 12 is inserted in the arc of the U-shaped ring 15, a gap 17 is arranged between the upper end of the horizontal shaft 12 and the inner side surface of the arc of the U-shaped ring 15, the gap 17 can ensure that the sealing cover 16 is always vertically downward, the gap 17 between the left end and the right end of the horizontal shaft 12 and the inner side surface of the arc of the U-shaped ring 15 is smaller, the front end and the rear end of the horizontal shaft 12 are fixed on a shaft bracket 14 through elastic check rings 13 for shafts, the shaft bracket 14 is fixedly connected with the end part of a telescopic rod 5 of an electric push rod, the electric push rod is the prior art, the central line of the telescopic rod 5 of the electric push rod is intersected and vertical, the motor controller 8 is fixed at the upper end of the driving motor 9, the button battery pack 7 and the wireless receiver 6 are also fixedly arranged at the upper end of the driving motor 9, the button battery pack 7 provides electric energy for the driving motor 9, the motor controller 8 and the wireless receiver 6, and the wireless receiver 6 is electrically connected with the input end of the motor controller 8; the application also includes a remote control system, in the first embodiment, the remote control system is a remote controller 11, the remote controller 11 includes a housing 27, a microprocessor 30, a dry battery 31, a start button 28, a reset button 29 and a wireless transmitter 26, the microprocessor 30 and the dry battery 31 are fixedly arranged in the housing 27 of the remote controller 11, the start button 28, the reset button 29 and the wireless transmitter 26 are fixedly arranged on the housing 27, the dry battery 31 provides electric energy for the microprocessor 30, the start button 28, the reset button 29 and the wireless transmitter 26, the start button 28 and the reset button 29 are both electrically connected with an input end of the microprocessor 30, an output end of the microprocessor 30 is electrically connected with the wireless transmitter 26, the wireless transmitter 26 is in signal connection with the wireless receiver 6, in the first embodiment, the remote controller 11, is used for controlling the positive and negative rotation of the driving motor 9 so as to control the extension and the shortening of the telescopic rod 5 in the electric push rod.

The working principle of the first embodiment is as follows: the empty measuring cup with the cover in the device is placed on an electronic balance 2 for weighing, the electronic balance 2 returns to zero after displaying stably, then a worker adjusts the capacity of a liquid transfer device 22 to a verification point, operates to absorb pure water according to the specified requirement, moves a liquid injection nozzle 21 of the liquid transfer device 22 to the upper part of a cup cover 4, then presses a start button 28 on a remote controller 11, a microprocessor 30 of the remote controller 11 controls a wireless transmitter 26 to transmit a signal to a wireless receiver 6 fixed on a driving motor 9, the wireless receiver 6 transmits the received signal to a motor controller 8, the motor controller 8 controls the driving motor 9 to work to shorten a telescopic rod 5 of an electric push rod until the telescopic rod 5 reaches the minimum length, in the process, a shaft bracket 14 fixed on the end part 5 of the telescopic rod 5, a horizontal shaft 12 on the bracket 14, a U-shaped ring 15 outside the horizontal shaft 12 and a small sealing cover 16 connected with the lower end of the U-shaped, when the telescopic rod 5 reaches the minimum telescopic amount, the motor controller 8 controls the driving motor 9 to stop working, and at the moment, the liquid adding hole 18 on the cup cover 4 is completely exposed.

Because the small arc-shaped hole 24 of the liquid adding hole 18 is above the inner wall 20 of the measuring cup 3, the inner wall 20 of the measuring cup 3 can be seen from the vertical downward view of the small arc-shaped hole 24, when a worker adds liquid in the measuring cup 3, the liquid injection nozzle 21 of the liquid transfer device 22 can be lightly attached to the inner wall 20 of the measuring cup 3 and the liquid transfer device 22 is inclined for a certain angle, the button on the liquid transfer device 22 is started, so that pure water in the liquid transfer device 22 flows downwards along the inner wall 20 of the measuring cup 3 through the liquid injection nozzle 21, after the pure water completely flows out from the liquid injection nozzle 21, the worker can control the liquid injection nozzle 21 to be attached to and move upwards along the inner wall 20 of the measuring cup 3, so that residual liquid on the liquid injection nozzle 21 can be left in the measuring cup 3, after the liquid injection nozzle 21 upwards flows along the inner wall 20 of the measuring cup 3, the worker can move away from the reset button 29 on the remote controller 11, the microprocessor on the remote controller 11 controls the wireless transmitter, wireless receiver 6 can give motor controller 8 with signal transmission after receiving the signal, motor controller 8 controls driving motor 9 work once more, make electric putter's telescopic link 5 extension until telescopic link 5 reaches maximum length value, at this in-process, fix the sealed lid 16 that the horizontal axis 12 and the U type ring 15 outside the horizontal axis 12 and the U type ring 15 lower extreme connected on the pedestal 14 and the pedestal 144 on telescopic end 5 can synchronous motion, when telescopic link 5 reaches maximum length value, motor controller 8 can control driving motor 9 stop work, at this moment, sealed lid 16 completely seals liquid feeding hole 18, electronic balance 2 weighs out pure water quality.

Use this application the device carries out the in-process of examining and determine to pipettor capacity, pure water evaporation area is the area in liquid feeding hole, and the area in liquid feeding hole is far less than the area of graduated flask mouth, it is sealed for automatically controlled removal simultaneously to be used for the sealed lid in sealed liquid feeding hole, consequently, this just makes the staff use the pipette to add the pure water to graduated flask inside after, the system can be fast, accurate, control electric putter steadily with sealed lid propelling movement to liquid feeding hole department in order to cover the liquid feeding hole sealed, compare in traditional operation, the time that the pure water exposes in the air has effectively been shortened in this application, the pure water evaporation capacity has effectively been reduced.

Example two:

as shown in fig. 7 to 11, different from the first embodiment, the remote control system of the second embodiment is different from the remote control system of the first embodiment, specifically: the remote control system of the second embodiment comprises a remote control shell 32, the remote control shell 32 is fixed on the workbench 1 through a support rod 33, a microprocessor 30 and a dry battery 31 are fixedly arranged in the remote control shell 32, a wireless transmitter 26 is fixedly arranged on the remote control shell 32, the height of the wireless transmitter 26 is consistent with that of the wireless receiver 6, and the wireless transmitter 26 faces the wireless receiver 6, so that the wireless receiver 6 can receive signals sent by the wireless transmitter 26; the second embodiment further comprises a foot switch 34 fixed on the ground, the dry battery 31 provides power for the microprocessor 30, the wireless transmitter 26 and the foot switch 34, the foot switch 34 is electrically connected with the input end of the microprocessor 30, and the wireless transmitter 26 is in signal connection with the wireless receiver 6.

The second embodiment has the working principle that: when the liquid adding hole 18 needs to be leaked so as to add pure water into the vector cup, a worker can pedal the foot switch 34 by foot, the foot switch 34 can feed back signals to the microprocessor 30, the microprocessor 30 controls the wireless transmitter 26 to send signals to the wireless receiver 6, the wireless receiver 6 can send the received signals to the motor controller 8 after receiving the signals, the motor controller 8 controls the driving motor 9 of the electric push rod to work so that the telescopic rod 5 of the electric push rod is shortened until the length of the telescopic rod 5 reaches the minimum value, at the moment, the sealing cover 16 is removed from the liquid adding hole 18, and the liquid adding hole 18 is completely leaked; after the staff has added pure water to graduated flask 3 in using pipettor 22, the staff can step on foot pedal switch 34 again with the foot, foot switch 34 can give microprocessor 30 with signal feedback again, microprocessor 30 control wireless transmitter 26 sends the signal to wireless receiver 6, wireless receiver 6 can give motor controller 8 with received signal transmission after receiving the signal, motor controller 8 control electric putter's driving motor 9 work makes electric putter's telescopic link 5 extension until telescopic link 5 length reaches the maximum value, at this moment, the sealed lid 16 with electric putter's telescopic link 5 end connection covers the liquid feeding hole 18 totally and seals.

Claims

1. The utility model provides a pipettor capacity is examined and is used evaporation error reducing device which characterized in that: the measuring cup with the cup cover comprises an electronic balance and a measuring cup with the cup cover, the upper end of the measuring cup is detachably and hermetically connected with the cup cover, a liquid adding hole is formed in the cup cover, a sealing cover capable of sealing the liquid adding hole is arranged above the liquid adding hole, the top of the sealing cover is fixedly connected with the end part of a telescopic rod of an electric push rod through a connecting piece, the electric push rod is fixed on the cup cover, a driving motor of the electric push rod is electrically connected with the output end of a motor controller fixed at the upper end of the driving motor, a button battery pack and a wireless receiver are further fixedly arranged at the upper end of the driving motor, the button battery pack provides electric energy for the driving motor, the motor controller and the wireless receiver, and the wireless receiver is electrically connected with; the remote control system is in signal connection with the wireless receiver.

2. The evaporation error reduction device for pipette capacity verification according to claim 1, characterized in that: still include the workstation, electronic balance places on the workstation.

3. The evaporation error reduction device for pipette capacity verification according to claim 2, characterized in that: the remote control system is the remote controller, the casing internal fixation of remote controller is equipped with microprocessor and dry battery, fixed start button, reset button and the wireless transmitter of being equipped with on the casing, the dry battery provides the electric energy for microprocessor, start button, reset button and wireless transmitter, start button, reset button all are connected with microprocessor's input electricity, wireless transmitter is connected to microprocessor's output electricity, wireless transmitter signal connection wireless receiver.

4. The evaporation error reduction device for pipette capacity verification according to claim 2, characterized in that: the remote control system comprises a remote control shell, the remote control shell is fixed on the workbench through a support rod, a microprocessor and a dry battery are fixedly arranged in the remote control shell, a wireless transmitter is fixedly arranged on the remote control shell, and the height of the wireless transmitter is consistent with that of a wireless receiver; the wireless remote control device is characterized by further comprising a foot switch fixed on the ground, the dry battery provides electric energy for the microprocessor, the wireless transmitter and the foot switch, the foot switch is electrically connected with the input end of the microprocessor, and the wireless transmitter is in signal connection with the wireless receiver.

5. The evaporation error reduction device for pipette capacity verification according to claim 1, characterized in that: the liquid feeding hole comprises a trapezoidal through hole, a small arc-shaped hole arranged on the left side of the trapezoidal through hole and a large arc-shaped hole arranged on the right side of the trapezoidal through hole, the small arc-shaped hole is located on one side far away from the electric push rod, and the small arc-shaped hole is located above the inner wall of the measuring cup.

6. The evaporation error reduction device for pipette capacity verification according to claim 1, characterized in that: the roughness of the lower end face of the sealing cover is less than 0.05 micron.

7. The evaporation error reduction device for pipette capacity verification according to claim 1, characterized in that: and the edge of the lower end of the sealing cover is provided with an arc chamfer.

8. The evaporation error reduction device for pipette capacity verification according to claim 1, characterized in that: the connecting piece include with sealing cover top central point department fixed connection's U type ring, the opening of U type ring is down, the circular arc interpolation of U type ring has the horizontal axis, there is the gap between the circular arc medial surface of the upper end of horizontal axis and U type ring, both ends are fixed on the pedestal through circlip for the axle around the horizontal axis, pedestal and electric putter's telescopic link tip fixed connection.