CN209086109U - A temperature-controlled viscosity detection device based on PID control - Google Patents

Abstract

The utility model provides a kind of temperature control viscosity detecting device based on PID control.The detection device includes viscosimeter bracket, viscosimeter, liquid circulation heating device and fluid temperature detection device；Liquid circulation heating device is made of detection liquid container, liquid heating, miniature circulating pump and liquid circulation container, detection liquid container is fixed on the underface of viscosimeter, the liquid circulation container is placed in below detection liquid container, it is connect by miniature circulating pump, return pipe and overflow pipe with detection container, liquid heating is mounted on return pipe；The fluid temperature detection device is made of PID controller and temperature sensor, and the temperature of liquid is detected by temperature sensor, and PID controller controls liquid heating and viscosimeter work.The utility model can carry out real-time monitoring to the temperature of testing liquid, and can ensure that testing liquid keeps temperature constant state in the detection process, it is ensured that the viscosity number that detected is just more accurate, accurately.

Description

A temperature-controlled viscosity detection device based on PID control

technical field

The utility model relates to a viscometer, in particular to a temperature-controlled viscosity detection device based on a PID control method.

Background technique

A viscometer is usually an instrument for measuring the physical properties of fluid viscosity. With the continuous improvement of product quality requirements, the technical requirements for the accuracy of product parameter data also increase. However, for the temperature of the measured object and the measured liquid, many people ignore these two points, thinking that the surface temperature of any liquid is consistent with the temperature inside the liquid, and the temperature difference is not important. When the internal temperature is constant at the same time, the result detected by the viscometer is the most stable and accurate; and the existing viscometers cannot determine the temperature of the liquid to be measured, nor can the viscosity of the liquid be detected at a constant temperature.

SUMMARY OF THE INVENTION

According to the deficiencies of the prior art, the present invention provides a temperature-controlled viscosity detection device based on a PID control method, which can monitor the actual temperature of the liquid in real time, and maintain the liquid temperature at a constant temperature for a long time, so that The user can more accurately detect the viscosity of the liquid during use, and can also ensure that the body surface temperature and the internal temperature of the liquid to be measured are not affected by the outside world during the detection process.

The technical solution provided by the utility model: the temperature-controlled viscosity detection device based on PID control is characterized in that: the detection device includes a viscometer support, a viscometer, a liquid circulation heating device and a liquid temperature detection device, and the The viscometer is installed above the viscometer support through a lifting frame; the liquid circulation heating device is composed of a detection liquid container, a liquid heating device, a micro circulation pump and a liquid circulation container, and the detection liquid container is fixed on the viscometer through the container support. Right below, the upper part of the detection liquid container is provided with an overflow port, and the lower part is provided with a return port. The liquid circulation container is placed under the detection liquid container, and the overflow port on the upper part of the detection liquid container leads to the liquid circulation through the overflow pipe. The liquid inlet of the container, the micro circulation pump is arranged at the liquid outlet of the liquid circulation container, and the micro circulation pump leads to the return port of the detection liquid container through the return pipe, and the liquid heating device is installed on the return pipe; the liquid temperature The detection device is composed of a PID controller and a temperature sensor. The temperature sensor is installed at the container port of the detection liquid container, and its signal output end is connected to the signal input end of the PID controller. The signal output end of the PID controller is respectively connected to the liquid heating. The control system of the device, the control motor of the lifting frame and the control system of the viscometer are connected.

The preferred technical solution of the present utility model: the detection device further comprises a base and a sealing cover, the sealing cover is a circular or square transparent cover body, and a sealing cover mouth embedding groove is correspondingly opened on the base, and the viscometer support , The liquid circulation heating device and the liquid temperature detection device are all set on the base. During the inspection, the sealing cover completely covers the viscometer, the viscometer support, the liquid circulation heating device and the liquid temperature detection device to form a closed viscosity detection device. space.

The preferred technical scheme of the utility model is as follows: the temperature sensor is a non-contact temperature sensor, and the temperature sensor is installed at a position where the mouth of the detection liquid container is higher than the detection liquid level through the sensor mounting bracket.

The preferred technical scheme of the present invention: the liquid heating device comprises a liquid circulation cavity and a heater arranged in the liquid circulation cavity, and the liquid circulation cavity is provided with a liquid inlet and a liquid outlet, and the liquid inlet The port is communicated with the micro circulation pump, and the liquid outlet is communicated with the return port of the detection liquid container.

The preferred technical scheme of the present utility model: the container support is composed of a container carrying plate and a connecting rod, and is fixedly connected with the viscometer support through the connecting rod, and a return pipe perforation is correspondingly opened at the bottom of the container support, and the return pipe passes through The perforation of the return pipe is communicated with the return port at the bottom of the detection liquid container.

A further technical scheme of the present utility model: the lifting frame includes a lifting motor, a lifting sleeve and a connecting rod, the viscometer is connected to the lifting sleeve through the connecting rod, and the lifting sleeve is sleeved on the viscometer support, and is moved along the edge under the action of the lifting motor. Move the viscometer holder up and down.

The length of the holder of the container holder of the utility model is greater than the total height of the whole viscometer, the detection rotor and the whole overflow device.

The non-contact temperature sensor of the utility model can directly transmit the detected temperature signal to the viscometer body in real time, so that the chip processor in the body can compare and analyze the actual data and the preset data. The body starts to run, and the viscosity is detected; if the preset value is not reached, the error value of the analysis result is transmitted to the PID controller in the constant temperature device. Make the final temperature error zero, thus conforming to the preset value. It can monitor the temperature of the liquid to be tested in real time, and can ensure that the liquid to be tested is kept at a constant temperature during the detection process, and the internal temperature of the liquid and the temperature of the body surface will not be inconsistent due to the influence of the external environment, ensuring that the detected viscosity value is more accurate. ,accurate.

Description of drawings

Fig. 1 is the structural representation of the present utility model;

Fig. 2 is the control principle diagram of PID controller.

In the picture: 1—base, 1-1—sealing cover groove, 2—viscometer, 3—viscosity stand, 4—lifting frame, 5—sealing cover, 6—detection liquid container, 6-1—overflow Port, 6-2—return port, 6-3—overflow pipe, 6-4—return pipe, 7—liquid heating device, 8—micro circulation pump, 9—liquid circulation container, 10—container holder, 11—PID Controller, 12—temperature sensor, 12-1—sensor mounting bracket.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings. A temperature-controlled viscosity detection device based on PID control as shown in FIG. 1 is characterized in that: the detection device includes a viscometer support 3, a viscometer 2, a liquid circulation heating device and a liquid temperature detection device, and also includes a base 1 And the sealing cover 5, the sealing cover 5 is a circular or square transparent cover body, and a sealing cover mouth embedding groove 1-1 is correspondingly opened on the base 1, the viscometer support 3, the liquid circulation heating device and the liquid temperature detection The devices are all set on the base 1. During inspection, the sealing cover 5 completely covers the viscometer 2, the viscometer support 3, the liquid circulation heating device and the liquid temperature detection device to form a closed viscosity detection space.

As shown in FIG. 1, the viscometer 2 is installed above the viscometer support 3 through a lifting frame 4, and the lifting frame 4 adopts the lifting mechanism of the existing viscometer, which specifically includes a lifting motor, a lifting sleeve and a connecting rod. 2 is connected to the lifting sleeve through the connecting rod, and the lifting sleeve is sleeved on the viscometer support 3 and moves up and down along the viscometer support 3 under the action of the lifting motor. The lifting stroke of the lifting mechanism can be set to ensure that the detection head of the viscometer 2 can automatically stop descending after entering the liquid, or the upper and lower limit sensors can be set on the viscometer support 3 to limit the position.

As shown in FIG. 1 , the liquid circulation heating device is composed of a detection liquid container 6 , a liquid heating device 7 , a micro circulation pump 8 and a liquid circulation container 9 . The detection liquid container 6 is fixed on the viscometer 2 through a container support 10 . Right below, the upper part of the detection liquid container 6 is provided with an overflow port 6-1, the lower part is provided with a return port 6-2, the liquid circulation container 9 is placed under the detection liquid container 6, and the upper part of the detection liquid container 6 is provided with an overflow port 6-1. The overflow port 6-1 leads to the liquid inlet of the liquid circulation container 9 through the overflow pipe 6-3, the micro circulation pump 8 is arranged at the liquid outlet of the liquid circulation container 9, and the micro circulation pump 8 passes through the return pipe 6-4. It leads to the return port 6-2 of the detection liquid container 6, and the liquid heating device 7 is installed on the return pipe 6-4. The liquid heating device 7 includes a liquid circulation cavity and a heater arranged in the liquid circulation cavity. The liquid circulation cavity is provided with a liquid inlet and a liquid outlet, and the liquid inlet is communicated with the micro-circulation pump 8, The liquid outlet communicates with the return port of the detection liquid container 6 . The container support 10 is composed of a container carrying plate and a connecting rod, and is fixedly connected with the viscometer support 3 through the connecting rod. A return pipe perforation is correspondingly opened at the bottom of the container support 10, and the return pipe 6-4 passes through the return pipe. The perforation communicates with the return port 6 - 2 at the bottom of the detection liquid container 6 .

As shown in FIG. 1, the liquid temperature detection device is composed of a PID controller 11 and a temperature sensor 12. The temperature sensor 12 is a non-contact temperature sensor, and the temperature sensor 12 is installed on the detection liquid through the sensor mounting bracket 12-1. The container port of the container 6 is higher than the position where the liquid level is detected, and its signal output end is connected to the signal input end of the PID controller 11. The signal output end of the PID controller 11 is respectively connected to the control system of the liquid heating device 7 and the control system of the lifting frame 4. The motor and the control system of the viscometer 2 are connected. The PID controller of the utility model is a linear regulator, which compares the preset value T1 with the actual value T2 ₍ controlled object) detected by the non _- contact temperature sensor to generate temperature deviation, Its principle diagram is shown in 2 and its proportional, integral and differential form the control quantity through linear combination, and its dynamic equation is written as:

Where K _p —— is the proportional amplification factor of the regulator

K _i — is the integral time constant

K _d —— is the differential time constant

The temperature PID regulator has three parameters that can be set, namely proportional method coefficient K _p , integral time constant K _i , and differential time constant K _d . The function of proportional adjustment is to stabilize the adjustment process, but it will generate steady-state error. The integral action can eliminate the steady-state error of the adjusted variable, but it may cause the system to oscillate or even become unstable, and the differential action can be effectively reduced. Dynamic Bias. Therefore, the effect of the PID controller depends to a large extent on the determination of the three control parameters of the PID. Its advantages are that the principle is simple, the use is convenient, and the adaptability is wide.

When the utility model detects, the liquid to be tested is put into the liquid container 6 to be tested, then the PID constant temperature device is turned on, and the sealing cover 5 covers the entire detection device, and the non-contact temperature sensor 12 detects the liquid container to be tested. The temperature of the liquid in The cooling instruction enables the liquid flowing through the liquid heating device 7 to be constant to the preset temperature and maintain the preset temperature. When the temperature of the detected circulating fluid remains constant after a certain period of time, the PID controller 11 feeds back the command with a zero comparison error back to the viscometer 2, that is, the lifting frame 4 of the viscometer 2 begins to descend so that the detection head enters the liquid container to be measured 6, and conduct viscosity detection on the liquid in the liquid container 6 to be measured. The utility model can effectively control the flow rate of the liquid to be detected through the sealing cover 1 and the micro circulation pump 8, which ensures that in harsh environments, the influence of uncertain factors such as temperature and impurities on the temperature of the liquid to be detected, and the temperature of the liquid surface is kept constant. and the internal temperature of the liquid to ensure the accuracy and reliability of the viscosity results of the tested liquid.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "perpendicular", "parallel", "inner", "outer", etc. The orientation or positional relationship, or the orientation or positional relationship that the utility model product is usually placed in use, is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation , are constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. a kind of temperature control viscosity detecting device based on PID control, it is characterised in that: the detection device includes viscosimeter bracket (3), viscosimeter (2), liquid circulation heating device and fluid temperature detection device, the viscosimeter (2) are pacified by crane (4) Above viscosimeter bracket (3)；The liquid circulation heating device be by detection liquid container (6), liquid heating (7), Miniature circulating pump (8) and liquid circulation container (9) composition, the detection liquid container (6) are fixed on viscous by pan straddle (10) The underface of degree meter (2) is equipped with overflow port (6-1) on the top of detection liquid container (6), and lower part is equipped with refluxing opening (6-2), described Liquid circulation container (9) is placed in below detection liquid container (6), and the overflow port (6-1) for detecting the top of liquid container (6) passes through overflow Pipe (6-3) leads to the inlet of liquid circulation container (9), and miniature circulating pump (8), which is arranged, goes out liquid in liquid circulation container (9) Mouthful, and miniature circulating pump (8) leads to the refluxing opening (6-2) of detection liquid container (6), the liquid heating by return pipe (6-4) Device (7) is mounted on return pipe (6-4)；The fluid temperature detection device is by PID controller (11) and temperature sensor (12) it forms, the temperature sensor (12) is mounted on the vessel port of detection liquid container (6), signal output end and PID control The signal input part of device (11) connects, the signal output end of PID controller (11) the control system with liquid heating (7) respectively The control system connection of system, the control motor of crane (4) and viscosimeter (2).

2. a kind of temperature control viscosity detecting device based on PID control according to claim 1, it is characterised in that: the inspection Surveying device further includes pedestal (1) and seal closure (5), seal closure (5) circle or rectangular transparent cover, on pedestal (1) It is corresponding to offer seal closure mouth embedded groove (1-1), the viscosimeter bracket (3), liquid circulation heating device and fluid temperature inspection It surveys device to be arranged on pedestal (1), when being checked, seal closure (5) is by viscosimeter (2), viscosimeter bracket (3), liquid Circulating heater and fluid temperature detection device are provide with completely, form a closed viscosity measurements space.

3. a kind of temperature control viscosity detecting device based on PID control according to claim 1 or 2, it is characterised in that: described Temperature sensor (12) is noncontact temperature sensor, and temperature sensor (12) is installed by mounting frame for sensor (12-1) It is higher than the position of detection liquid level in detection liquid container (6) vessel port.

4. a kind of temperature control viscosity detecting device based on PID control according to claim 1 or 2, it is characterised in that: described Liquid heating (7) includes liquid circulation cavity and setting in the intracorporal heater composition of liquid circulation chamber, in liquid circulation Cavity is equipped with inlet and liquid outlet, and inlet is connected to miniature circulating pump (8), liquid outlet and detection liquid container (6) Refluxing opening connection.

5. a kind of temperature control viscosity detecting device based on PID control according to claim 1 or 2, it is characterised in that: described Pan straddle (10) is made of container carrier and connecting rod, and is fixedly connected by connecting rod with viscosimeter bracket (3), in container Bracket (10) bottom is corresponding to offer return pipe perforation, and the return pipe (6-4) passes through return pipe and perforates and detect liquid container (6) The refluxing opening (6-2) of bottom is connected to.

6. a kind of temperature control viscosity detecting device based on PID control according to claim 1 or 2, it is characterised in that: described Crane (4) includes that lifting motor, lifting set and connecting rod, viscosimeter (2) are connected to lifting by connecting rod and put on, and lifting is arranged It is moved up and down on viscosimeter bracket (3), and under the action of lifting motor along viscosimeter bracket (3).