Device for testing viscoelasticity of liquid by using resilience force of magnetic field

Abstract

The invention relates to the technical field of liquid testing, in particular to a device for testing viscoelasticity of liquid by using resilience force of a magnetic field. Comprising a detection container, a detection probe, a middle-layer channel and an outer-layer channel, a second bearing is arranged on the detection probe, the detection probe is rotationally connected with the middle-layer channel through the second bearing, a first bearing is arranged on the middle-layer channel, and the middle-layer channel is rotationally connected with the outer-layer channel through the first bearing; a magnetic conductive material is arranged above the middle-layer channel and is fixedly connected with a detection probe, a radial magnetic ring is arranged around the magnetic conductive material, the radial magnetic ring is fixedly connected with the outer-layer channel and keeps a distance from the magnetic conductive material, a magnet is fixedly connected to the top of the detection probe, and an angle detection plate is arranged above the magnet; the angle detection plate is fixedly connected with the outer-layer channel and keeps a distance from the magnet, and a linkage rod is connected below the middle-layer channel. According to the technical scheme, calibration can be carried out in time, errors caused by environment changes are avoided, and it is guaranteed that the system can accurately measure the viscoelasticity of liquid.

Description

Technical Field

[0001] This invention relates to the field of liquid testing technology, specifically to a device for testing the viscoelasticity of liquids using magnetic field rebound force. Background Technology

[0002] Macromolecules exist in both solid and liquid states. Through melting, they can transform from solid to liquid and flow; through cooling, they can harden and transform from liquid to solid. Therefore, macromolecules exhibit properties of both solids and liquids in different states, namely elasticity and viscosity. However, due to the long-chain structure of polymer macromolecules and the gradual nature of their motion, polymer deformation and flow cannot be purely elastic or purely viscous. This response to force, possessing characteristics of both elastic solids and viscous fluids, is called viscoelasticity.

[0003] Liquid viscoelasticity refers to the simultaneous exhibiting of viscosity (like a fluid) and elasticity (like a solid) in a liquid. Examples of viscoelastic liquids include blood, asphalt, and solidified gasoline. There are many methods for testing liquid viscoelasticity, primarily using the physical properties of the liquid, such as the suspended wire method and the elasticity meter. However, these methods have the following drawbacks: 1. Difficult to debug; 2. The manufacturing of suspension wires and springs is difficult, and consistency is hard to guarantee; 3. The suspension wire remains hanging down under the action of gravity, and the change in the torque of the suspension wire is detected to detect the change in angle. When it is not horizontal or is affected by external factors, the suspension wire will have an angle with the rotating shaft of the rotating motor, resulting in inaccurate angle measurement. 4. Using a combination of a geared motor and a cam mechanism to achieve oscillation: complex structure, poor precision, and easy wear. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the viscoelasticity of liquids using the rebound force of a magnetic field. This technical solution can be calibrated in a timely manner, avoiding errors caused by environmental changes, and ensuring that the system can accurately measure the viscoelasticity of liquids.

[0005] To achieve the above objectives, the present invention provides a basic solution: a device for testing the viscoelasticity of liquids using magnetic field rebound force, comprising a detection container, a detection probe, a middle channel, and an outer channel. The detection probe is provided with a second bearing, and the detection probe is rotatably connected to the middle channel through the second bearing. The middle channel is provided with a first bearing, and the middle channel is rotatably connected to the outer channel through the first bearing. A magnetically conductive material is disposed above the middle layer channel, and the magnetically conductive material is fixedly connected to the detection probe. A radial magnetic ring is disposed around the magnetically conductive material, and the radial magnetic ring is fixedly connected to the outer layer channel and maintains a distance from the magnetically conductive material. A magnet is fixedly connected to the top of the detection probe, and an angle detection plate is disposed above the magnet. The angle detection plate is fixedly connected to the outer layer channel and maintains a distance from the magnet. A linkage rod is connected below the middle layer channel. The angle detection plate, magnet, detection probe, radial magnetic ring, and linkage rod are all symmetrical in shape and their axes coincide.

[0006] Beneficial effects of the basic scheme: This technical scheme changes the original method of measuring liquid viscoelasticity by using the rebound force provided by the torsional deformation of the suspension wire or the bending deformation of the elasticity gauge, to using the attraction of a magnetic field. The attraction of a magnetic field remains almost unchanged for decades. The change of the attraction of a magnetic field is more stable than that of deformation, and there is no fatigue or softening, resulting in a long service life. Even though the torque generated by the viscoelasticity of the liquid is very small, it can still be sensed by the attraction of the magnetic field.

[0007] This technology uses a probe as the core component for detection. The probe is a rigid structure, and the entire device is an integrated structure. Regardless of whether it is horizontal or affected by other external factors, the probe is always parallel to the axis of the rotating motor, which does not affect the measurement results.

[0008] The outer channel provides support and protection for the internal device. The radial magnetic ring on the outer channel and the magnetic material on the detection probe ensure that the probe remains stable under magnetic force. The inner channel is connected to the detection container via a linkage rod. Rotating the detection container can drive the middle channel to rotate, generating friction. This balances the magnetic attraction and friction, allowing the device to be calibrated before testing, thus ensuring the accuracy of the device.

[0009] As a preferred embodiment, the angle detection plate is equipped with a magnetic encoder, which includes a disk, a magnetic sensor, and an adjustment circuit; the disk is rotatably connected to the angle detection plate and is magnetized, and magnetic poles are provided on its circumference.

[0010] As a preferred embodiment, both the first bearing and the second bearing are provided in multiple units.

[0011] The arrangement of multiple bearings allows the probe shaft to be evenly supported and stably fixed.

[0012] As a preferred embodiment, the detection container is also fixedly connected to a rotary motor.

[0013] The rotary motor makes the testing container rotate more evenly, and the controllable speed of the rotary motor also allows for control of the rotation force, making it suitable for different types of liquids to be tested.

[0014] As a preferred embodiment, a probe sleeve is detachably connected to the bottom of the detection probe, the probe sleeve covering the bottom of the detection probe, and the axis of the probe sleeve coinciding with the axis of the probe shaft. The probe sleeve isolates the detection probe from the liquid being tested. Its detachable design allows for replacement of the probe sleeve after each test, preventing contamination of the current test liquid by liquid residue from the previous test, thus ensuring accurate results. This covering design also improves the probe sleeve's transmission effect on the probe shaft, further guaranteeing accuracy. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a device that uses the rebound force of a magnetic field to test the viscoelasticity of a liquid. Detailed Implementation

[0016] The technical solution of this application will be further described in detail below through specific embodiments: The attached diagram is labeled as follows: 1. Rotary motor; 2. Detection container; 3. Detection probe; 4. Detected liquid; 5. Linkage rod; 6. Middle channel; 7. First bearing; 8. Second bearing; 9. Outer channel; 10. Radial magnetic ring; 11. Magnetic material; 12. Magnet; 13. Angle detection plate.

[0017] In the description of this invention, it should be noted that the terms "upper," "lower," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection (including various forms of mechanical connection, such as couplings or gear pairs) or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] Example 1 like Figure 1The device shown is for testing the viscoelasticity of a liquid using the rebound force of a magnetic field. It includes a detection probe 3, a middle channel 6, and an outer channel 9. The detection probe 3 is provided with a plurality of second bearings 8 and is rotatably connected to the middle channel 6 through the second bearings 8. The middle channel 6 is provided with a plurality of first bearings 7 and is rotatably connected to the outer channel 9 through the first bearings 7.

[0020] A magnetically conductive material 11 is disposed above the middle channel 6, and is fixedly connected to the detection probe 3. A radial magnetic ring 10 is disposed around the magnetically conductive material 11, and is fixedly connected to the outer channel 9 and maintains a distance from the magnetically conductive material 11. The magnetically conductive material 11 is magnetized by the radial magnetic ring 10 and remains stable under the action of magnetic field attraction, thereby stabilizing the detection probe 3. A magnet 12 is fixedly connected to the top of the detection probe 3, and an angle detection plate 13 is disposed above the magnet 12. The angle detection plate 13 is fixedly connected to the outer channel 9 and maintains a distance from the magnet 12. A linkage rod 5 is connected below the middle channel 6. In this embodiment, the middle channel 6 and the linkage rod 5 are detachably connected, and an appropriate linkage rod 5 is selected according to the size of the detection container 2. The angle detection plate 13, magnet 12, detection probe 3, radial magnetic ring 10, and linkage rod 5 are all symmetrical in shape and their axes coincide.

[0021] In this embodiment, the angle detection plate 13 is equipped with a magnetic encoder, which includes a disk, a magnetic sensor, and an adjustment circuit. The disk is rotatably connected to the angle detection plate 13 and is magnetized, with many magnetic poles arranged on its circumference. When the detection probe 3 rotates, the magnet 12 also rotates along with it. Under the action of magnetic force, the disk is also driven to rotate. The magnetic sensor detects the change in the magnetic field during rotation and statistically analyzes the sinusoidal signal waveform corresponding to the original magnetic signal. The adjustment circuit amplifies the signal and uses frequency division or interpolation to generate the required output.

[0022] The test container 2 is also fixedly connected to a rotary motor 1. The rotary motor 1 can drive the test container 2 to rotate during the test, making the rotation of the test container 2 more uniform. At the same time, the rotary motor 1 has controllable gears, so the rotation force can also be controlled, which can adapt to different types of liquids to be tested.

[0023] In practical use, the linkage rod 5 is relatively fixed in the circumferential direction of the detection container 2. Before the liquid to be tested 4 is tested, the rotary motor 1 drives the detection container 2 to rotate around the axis. Since the linkage rod 5 is fixedly connected to the middle channel 6, when the detection container 2 rotates, the middle channel 6 will rotate relative to the outer channel 9 through the first bearing 7 because the outer channel 9 is fixed. Under the influence of friction, the detection probe 3 will also be driven to rotate by the second bearing 8. Finally, the friction and magnetic attraction reach a balance.

[0024] After the test liquid is added, the test liquid 4 and the test probe 3 rotate relative to each other due to viscoelasticity. The magnetic encoder on the angle detection plate 13 will detect the change in the magnetic field of the magnet 12 on the test probe 3. The sensor converts the change in the electrical signal caused by the change in the magnetic field into a change in the angle value, which directly reflects the change in the rotation angle of the test probe 3. Thus, the initial viscosity value and the change in viscosity can be obtained, thereby reflecting the viscosity characteristics of the test liquid.

[0025] Example 2 The technical feature that distinguishes this embodiment from Embodiment 1 is that the rotary motor 1 is an intelligent servo motor. The closed-loop control of the motor involves current loop, speed loop and position loop control. Closed-loop control is achieved through PID control algorithm to ensure that the motor can accurately reach the required target speed and position, and to ensure that the motor can operate steplessly under various working conditions.

[0026] When powered on, the rotary motor 1 rotates according to the given current magnitude and direction. Current loop control ensures that the current generated during motor rotation remains consistent with the given current magnitude and direction. Specifically, the control method involves measuring the motor's output current through a feedback circuit, comparing it with the given current, and then performing PID control to achieve closed-loop control of the current loop by continuously adjusting the output voltage.

[0027] The motor's speed is controlled not only by the circuit current but also by the mechanical load. Speed ​​loop control can achieve the desired target speed for the motor. Specifically, this control method involves measuring the motor's speed, comparing it to the target speed, and then performing PID control to achieve closed-loop speed control by continuously adjusting the output voltage.

[0028] After the rotary motor 1 reaches the desired target speed, it still needs to rotate to the desired target position. Position loop control can achieve the target position control of the motor. Specifically, the control method involves measuring the position output by the motor, comparing it with the target position, and then performing PID control to achieve closed-loop control of the position loop by continuously adjusting the output voltage.

[0029] Example 3 The technical feature that distinguishes this embodiment from Embodiment 2 is that the intelligent servo motor also has a built-in motion control algorithm. The intelligent servo motor runs according to a pre-set position-time curve. Based on the actual setting of the motor's running curve, it can simulate various application scenarios, such as the flow of blood in blood vessels, and ensure that the motor can run smoothly at a low speed of 0.01 RPM.

[0030] Example 4 The key technical difference between this embodiment and Embodiment 1 lies in the fact that a probe sleeve is detachably connected to the bottom of the detection probe 3. In this embodiment, to ensure that the probe sleeve can effectively drive the detection probe 3 to rotate, the probe sleeve covers the bottom of the detection probe 3, and the axis of the probe sleeve coincides with the axis of the probe shaft. The probe sleeve can separate the probe shaft from the liquid being tested 4, preventing the probe shaft from contacting the liquid being tested 4 and being corroded or contaminated, thus further ensuring the measurement accuracy of this device. At the same time, by replacing the probe sleeve when collecting blood coagulation viscoelasticity or other similar liquids that require standardized operation, contamination between different liquids being tested can also be avoided.

[0031] The above content is merely an embodiment of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can improve and implement this solution based on the guidance provided in this application and their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for testing the viscoelasticity of a liquid using magnetic field rebound force, comprising a testing container, characterized in that: It also includes a detection probe, a middle layer channel, and an outer layer channel. The detection probe is provided with a second bearing and is rotatably connected to the middle layer channel through the second bearing. The middle layer channel is provided with a first bearing and is rotatably connected to the outer layer channel through the first bearing. A magnetically conductive material is disposed above the middle layer channel, and the magnetically conductive material is fixedly connected to the detection probe. A radial magnetic ring is disposed around the magnetically conductive material, and the radial magnetic ring is fixedly connected to the outer layer channel and maintains a distance from the magnetically conductive material. A magnet is fixedly connected to the top of the detection probe, and an angle detection plate is disposed above the magnet. The angle detection plate is fixedly connected to the outer layer channel and maintains a distance from the magnet. A linkage rod is connected below the middle layer channel. The angle detection plate, magnet, detection probe, radial magnetic ring, and linkage rod are all symmetrical in shape and their axes coincide.

2. The device for testing the viscoelasticity of liquids using magnetic field rebound force according to claim 1, characterized in that: The angle detection plate is equipped with a magnetic encoder, which includes a disk, a magnetic sensor, and an adjustment circuit; the disk is rotatably connected to the angle detection plate and is magnetized, and magnetic poles are provided on its circumference.

3. The device for testing the viscoelasticity of liquids using magnetic field rebound force according to claim 1, characterized in that: Both the first bearing and the second bearing are provided in multiple units.

4. The device for testing the viscoelasticity of liquids using magnetic field rebound force according to claim 1, characterized in that: The detection container is also rotatably connected to a rotary motor.

5. The device for testing the viscoelasticity of liquids using magnetic field rebound force according to claim 1, characterized in that: The bottom of the detection probe is detachably connected to a probe sleeve, which covers the bottom of the detection probe and the axis of the probe sleeve coincides with the axis of the probe shaft.

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