CN213956894U

CN213956894U - Automatic sampling and mixing device

Info

Publication number: CN213956894U
Application number: CN202022730524.XU
Authority: CN
Inventors: 杨宁; 张学成
Original assignee: Shanghai Jitao Automation Technology Co ltd
Current assignee: Jitao Automation Technology (Shanghai) Co.,Ltd.
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-08-13
Anticipated expiration: 2030-11-23

Abstract

The utility model relates to an automatic sample mixing device, including stirred vessel and the agitating unit of taking the container lid, still include the weighing module, agitating unit is including setting up rotor and magnetic drive device and the installation casing in stirred vessel, and the weighing module is installed at the top of installation casing, is supporting with it stirred vessel, magnetic drive device set up in the installation casing, are used for the drive the rotor rotates. The beneficial effects are that: the utility model has simple structure, integrates the weighing and the magnetic stirring into a whole, has high reliability, and has high efficiency because a plurality of inspection mechanisms are arranged in the sampling and mixing process; the safety is high, and the safety risk of chemicals to personnel is avoided; and the unattended application scene is met.

Description

Automatic sampling and mixing device

Technical Field

The utility model relates to a used online analytical instrument technical field in chemistry experiment room and the industrial production process related to chemicals specifically is an automatic sample mixing device.

Background

In a chemical laboratory or an industrial production process related to chemicals, sampling and uniformly mixing liquid to be detected are mainly manually operated in the past, the sampling and uniformly mixing process comprises two basic steps of weighing and stirring, and then subsequent analysis is carried out. The manual sampling and mixing process has the problems of high labor cost, low continuous working reliability, safety risk of chemicals to people and the like no matter whether a balance, a stirrer and the like are used for assisting. Under the background of the information, digital and intelligent times, the demand on automatic and unattended analytical instruments is increasing day by day, and under the trend and the demand, people also put higher requirements on the process of sampling and mixing chemicals.

A typical chemical laboratory sampling and mixing process can be described as weighing with an analytical balance or electronic balance followed by stirring with a stir bar. A better solution is to use a magnetic stirrer with weighing function, combining two steps into one step.

SUMMERY OF THE UTILITY MODEL

The utility model provides an automatic sampling mixing device who weighs the function in area for solving above-mentioned technical problem.

The technical scheme is as follows,

the utility model provides an automatic sample mixing device, is including taking stirred tank and agitating unit of container lid, its characterized in that still includes weighing module, agitating unit is including setting up rotor and magnetic drive device and installation casing in the stirred tank, weighing module installs the top of installation casing is supporting with it stirred tank, magnetic drive device sets up in the installation casing, be used for the drive the rotor rotates.

As a further improvement, the magnetic driving device comprises a stepping motor, two magnets and a magnet mounting bracket, the stepping motor is mounted at the bottom in the mounting shell through the motor mounting bracket, a rotating shaft of the stepping motor is arranged upwards, the magnet mounting bracket is mounted on the rotating shaft of the stepping motor, the two magnets are respectively arranged at two ends of the magnet mounting bracket, the distance between the two magnets corresponds to the length of the rotor, and the weighing module is located between the two magnets.

As a further improvement, a sunken groove is formed in the center of the top of the mounting shell, the weighing module is mounted in the sunken groove and protrudes out of the top of the mounting shell by 1-1.5mm, and a wire embedding groove is further formed in the top of the mounting shell and connected with the sunken groove and used for fixing a cable of the weighing module.

As a further improvement, the outer layer of the rotor is coated with a corrosion-resistant layer.

As a further improvement, the corrosion-resistant layer is a polytetrafluoroethylene layer.

As a further improvement, the shape of the stirring container is conical, the top of the stirring container is in a straight cylinder type design without flanging, and the bottom of the container cover is matched with the shape of the straight cylinder type top of the stirring container, so that the container cover is buckled with the stirring container.

Advantageous effects

The beneficial effects are that: the utility model has simple structure, integrates the weighing and the magnetic stirring into a whole, has high reliability, and has high efficiency because a plurality of inspection mechanisms are arranged in the sampling and mixing process; the safety is high, and the safety risk of chemicals to personnel is avoided; and the unattended application scene is met.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a schematic view of the assembled appearance of the present invention;

fig. 3 is a left side view of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is a schematic view of the installation position of the weighing module of the present invention.

Reference numbers in the figures:

1. container lid 2, stirred vessel 3, weighing module

4. Rotor 5, magnetic drive device 501, stepping motor

502. Magnet 503, magnet mounting bracket 504, motor mounting bracket

6. Installation shell 601, sunken groove 602 and wire embedding groove

Detailed Description

In order to further understand and appreciate the structural features and advantages of the present invention, preferred embodiments and the accompanying drawings are described in detail as follows:

as shown in fig. 1-2, an automatic sampling and blending device comprises a stirring container 2 with a container cover 1, a stirring device, and a weighing module 3, wherein the stirring device comprises a rotor 4, a magnetic driving device 5 and an installation shell 6 which are arranged in the stirring container 2, the weighing module 3 is arranged at the top of the installation shell 6 and is used for supporting the stirring container 2 and weighing chemicals filled in the stirring container 2, the magnetic driving device 5 is arranged in the installation shell 6 and is used for driving the rotor 4 to rotate, and the chemicals in the stirring container 2 are stirred and mixed uniformly by rotating the rotor 4. The material can be selected according to actual conditions to stirred vessel 2, for example corrosion-resistant and heat resistance etc. can be considered, the utility model discloses select the quartzy material. The design of the stirred vessel 2 takes into account the volume of chemical added to the vessel, as well as the size of the sensor and depth of immersion chemical inserted into the vessel through the vessel lid 1, such as a temperature sensor, pH sensor, conductivity sensor, ORP sensor, ion selective electrode, reference electrode, etc. Since chemicals to be mixed in the agitation vessel 2 are generally extremely corrosive, the rotor 4 is coated with a corrosion-resistant layer, preferably a polytetrafluoroethylene layer, which is corrosion-resistant, heat-resistant, and cold-resistant, and is inexpensive.

Specifically, as shown in fig. 3 to 4, the magnetic driving device 5 includes a stepping motor 501, two magnets 502 and a magnet mounting bracket 503, the stepping motor 501 is mounted at the bottom inside the mounting housing 6 through a motor mounting bracket 504, and the rotating shaft thereof is disposed upward, the magnet mounting bracket 503 is mounted on the rotating shaft of the stepping motor 501, the two magnets are respectively disposed at both ends of the magnet mounting bracket 503, and the distance between the two magnets 502 corresponds to the length of the rotor 4, and if the rotor 4 is too short, the rotor 4 may not be driven through the magnets 502. The stepping motor 501 adopts closed-loop control and is provided with communication feedback to ensure the normal operation of the motor.

The weighing module 3 is located between two magnets 502. Since the weighing module 3 needs to be well fixed and cannot be inclined, otherwise, the measurement accuracy is affected, a sunken groove 601 is formed in the center of the top of the mounting shell 6, and the weighing module 3 is fixed in the sunken groove 601 through mounting screws at the bottom of the weighing module and protrudes 1-1.5mm above the top of the mounting shell 6 to be in direct contact with the bottom of the stirring container 2, so that the weighing purpose is achieved. Selection at the weighing module 3: in terms of size: the diameter must not be too large, otherwise the magnet distance will become large and the diameter of the bottom of the mixing container 2 will be forced to be enlarged because the rotor 4 is longer. The height should not be too high, otherwise the magnet mounting bracket 503 would be forced to be designed high and the stability of the electrode rotation would be compromised. The utility model preferably uses a weighing module 3 with a diameter of 10mm and a total height of 12mm, wherein the height of 1mm at the top is protruded above the mounting shell 6 and is directly contacted with the stirring container 2, thereby achieving the purpose of weighing; in terms of measuring range: to meet the actual demand, the measuring range is too small and easily exceeds the upper limit, and the measuring precision is reduced if the measuring range is too large, the utility model preferably uses the weighing module with the range of 0-500 g; in terms of precision: considering practical use, need match with the weight of adding chemicals at every turn, the chemical quantity that adds at least once is regarded as the precision selection index, the utility model discloses preferred use the weighing module of precision 0.5 gram.

As shown in fig. 5, the flat cable of the weighing module 3 cannot interfere with the rotation of the magnet, and needs to be reasonably designed through the shell to be effectively isolated. Because of the utility model discloses the external diameter of preferred weighing module's cable is 2mm, and 6 top thickness of installation casing are 2.5mm, through opening a dark 2 mm's buried line groove 602 at the casing top, and buried line groove 602 connects formula recess 601 that sinks, fixes the cable at the inslot to reach the cable and do not interfere magnet, do not stand out outside the casing again simultaneously, can not influence the contact of weighing module 3's top and stirred vessel 2's bottom.

As shown in fig. 4, in order to ensure the weighing accuracy of the weighing module 3, the mixing container 2 and the container cover 1 are designed to reduce the vertical force applied to the container cover 1 by the mixing container 2 as much as possible, so that the mixing container 2 and the chemical in the mixing container 2 are applied to the weighing module as much as possible, and thus the mixing container 2 is conical, and the top thereof is designed to be a straight cylinder without flanging, and the bottom of the container cover 1 is matched with the straight cylinder type top of the mixing container 2 in shape, so that the container cover 1 is fastened with the mixing container 2. The container cover 1 is usually provided with a plurality of holes for fixing pipelines for adding water and chemicals, a typical joint thread is 1/4-28UNF, and holes or threads for fixing measuring sensors such as a temperature sensor, a pH sensor, a conductivity sensor, an ORP sensor, an ion selective electrode, a reference electrode and the like can be arranged according to needs.

The utility model discloses concrete operating procedure:

1.) in a state where the agitation vessel 2 is empty and the stepping motor 501 is stopped, the weighing module 3 performs weighing, compares the weighing result with a preset vessel weight, and calculates an absolute value of a difference between the two, thereby confirming that the deviation amount of the weighing module itself is within an allowable range. The source of this offset may be sensor aging of the weighing module itself, or a shift in the measured value due to its own over time during use.

2.) after confirming that the accuracy of the weighing module meets the use requirement of the instrument, a quantitative pump body (such as a syringe pump, a plunger pump and a peristaltic pump) is used for extracting a chemical solution to be detected from the chemical container to be detected and pumping the chemical solution into the stirring container 2 of the device.

3.) starting the stepping motor 501 and assigning a proper rotating speed, and driving the magnet mounting bracket 503 by the stepping motor to rotate the magnet 502, so as to change the magnetic field and drive the rotor 4 in the stirring container 2 to rotate, thereby achieving the purpose of stirring the liquid in the blending container. After the rotor is stirred for a certain time, the stepping motor 501 is stopped, and the stirring is stopped, and the solution is in a uniform mixing state. After a starting instruction of a specific rotating speed is given to the stepping motor, closed-loop control is performed between the stepping motor and the drive, so that the motor is ensured to operate effectively, and meanwhile, the upper computer reads the current state (such as start-stop state, rotating speed and the like) of the stepping motor in real time, so that the aim of double inspection is fulfilled.

4.) after the stepping motor stops, the weighing module 3 carries out weighing again, calculates the difference value with the last measurement, and judges whether to add chemicals with corresponding weight according to the instruction requirement by combining the instruction issued to the quantitative pump body. If the error is not expected or exceeds the allowable error range, an alarm is given. If the difference between the density of the liquid and the density of the water is large, the density of the corresponding liquid needs to be preset in an upper computer so as to facilitate unit conversion between the volume of the quantitative pump body and the weight measured by the weighing module. The upper computer can be a programmable logic controller, and can also be a circuit system (such as a single chip microcomputer, a real-time operating system, an embedded Linux system and the like) which is independently developed, and is used in combination with the touch screen.

5.) if the weighing result is consistent with the chemical quantity required to be added by the quantitative pump body or within the error tolerance range, repeating the previous 4 steps, namely entering the adding process of the next solution until all the liquid to be measured is added. The repeated process can be regarded as a group of operation control units, and the operation control units can be involved in the whole process in the complex chemical detection or automatic titration process, do not necessarily need to be continuously repeated, and can be executed as required.

In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and all equivalent changes and modifications of the shapes, structures, features and spirit described in the claims of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides an automatic sample mixing device, is including taking stirred tank and agitating unit of container lid, its characterized in that still includes weighing module, agitating unit is including setting up rotor and magnetic drive device and installation casing in the stirred tank, weighing module installs the top of installation casing is supporting with it stirred tank, magnetic drive device sets up in the installation casing, be used for the drive the rotor rotates.

2. The automatic sampling and uniformly mixing device according to claim 1, wherein the magnetic force driving device comprises a stepping motor, two magnets and a magnet mounting bracket, the stepping motor is mounted at the bottom in the mounting shell through the motor mounting bracket, the rotating shaft of the stepping motor is upwards arranged, the magnet mounting bracket is mounted on the rotating shaft of the stepping motor, the two magnets are respectively arranged at two ends of the magnet mounting bracket, the distance between the two magnets corresponds to the length of the rotor, and the weighing module is positioned between the two magnets.

3. The automatic sampling and uniformly mixing device according to claim 1, wherein a sunken groove is formed in the center of the top of the mounting shell, the weighing module is mounted in the sunken groove and protrudes out of the top of the mounting shell by 1-1.5mm, a wire embedding groove is further formed in the top of the mounting shell and connected with the sunken groove and used for fixing a cable of the weighing module.

4. The automatic sampling and blending device of claim 1, wherein the outer layer of the rotor is coated with a corrosion-resistant layer.

5. The automatic sampling and blending device of claim 4, wherein the corrosion-resistant layer is a polytetrafluoroethylene layer.

6. The automatic sampling and blending device of claim 1, wherein the stirring container is conical, the top of the stirring container is in a straight cylinder design without flanging, and the bottom of the container cover is matched with the straight cylinder top of the stirring container in shape, so that the container cover is buckled with the stirring container.