Liquid viscoelasticity testing device and method based on magnetic force detection

Abstract

The invention relates to the technical field of liquid testing, in particular to a liquid viscoelasticity testing device and method based on magnetic force detection. Comprising a probe shaft, a corner detection module and a liquid container, the top of the probe shaft is fixedly connected with a radial magnetic block, a magnetizing piece is arranged above the radial magnetic block, the probe shaft, the radial magnetic block and the magnetizing piece are symmetrical and are overlapped in axis, and a distance is kept between the radial magnetic block and the magnetizing piece. According to the technical scheme, the viscoelasticity of the liquid can be measured more accurately, and the device is simple in structure and easy to debug and maintain.

Description

Technical Field

[0001] This invention relates to the field of liquid testing technology, specifically to a liquid viscoelasticity testing device and method based on magnetic force detection. 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 equipment is easily affected by gravity, which can cause the suspension wires to become "off-center"; 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 propose a liquid viscoelasticity testing device and method based on magnetic force detection. This technical solution can more accurately measure the viscoelasticity of liquids, and the device has a simple structure and is easy to debug and maintain.

[0005] To achieve the above objectives, the present invention provides a basic solution: a liquid viscoelasticity testing device based on magnetic force detection, comprising a probe shaft, a rotation angle detection module, and a liquid container; a radial magnetic block is fixedly connected to the top of the probe shaft, and a magnetized element is disposed above the radial magnetic block; the probe shaft, the radial magnetic block, and the magnetized element are all symmetrical in shape and their axes coincide, and the radial magnetic block and the magnetized element maintain a distance.

[0006] Beneficial effects of the basic scheme: The liquid container is used to hold the liquid to be tested. The end of the probe shaft is inserted into the liquid to be tested. During the test, the liquid container is rotated. The liquid container drives the liquid to be tested to rotate together through viscoelasticity. The rotating liquid drives the probe shaft to rotate through viscoelastic force. That is, the container is the driver. The probe shaft is driven to rotate through the liquid to be tested, which in turn drives the radial magnetic block to rotate and forms an angle with the magnetized part. The angle detection module detects the angle value and reflects the viscoelasticity of the liquid to be tested through the angle.

[0007] This technical solution replaces the original method of measuring liquid viscoelasticity by using the rebound force provided by the torsional deformation of a suspension wire or the bending deformation of a force gauge, with the method of using the attraction of a magnetic field. Magnetic attraction remains almost constant over decades, and changes in magnetic attraction are more stable than deformation, without fatigue or softening, resulting in a long service life. Even though the torque generated by liquid viscoelasticity is very small, it can still be sensed by magnetic attraction.

[0008] Meanwhile, this device has a simple structure, few parts, is easy to process, easy to assemble and debug, and the magnetic field strength can be easily adjusted by distance, which facilitates on-site debugging during production.

[0009] As a preferred embodiment, the system also includes a channel body, with the probe shaft disposed inside the channel body and its axis coinciding with the axis of the channel body, and the magnetizing element fixedly connected to the channel body.

[0010] The main channel provides support and protection for each component, ensuring that the positional and connection relationships between the components remain stable and are not easily damaged by external forces.

[0011] As a preferred embodiment, the probe shaft is provided with a number of bearings at intervals on its shaft body, and the probe shaft is rotatably connected to the channel body through the bearings.

[0012] The probe shaft is connected to the channel body through bearings, ensuring that the probe shaft can rotate smoothly under the action of the liquid being tested while being protected and supported by the channel body; the two bearings ensure that the probe shaft is evenly supported and can be stably fixed.

[0013] As a preferred embodiment, the radial magnetic block is a radial magnet and is cylindrical in shape.

[0014] The high carbon content and hardness of the magnets make them more durable, further ensuring the accuracy of detection in the field of testing. The cylindrical shape ensures that the space inside the cylinder is still within the distribution range of the external magnetic field, and some magnetic field lines are connected to the magnetic poles at both ends through the inner hole of the magnetic ring, making the device more sensitive to the micro-torque generated by the viscoelastic force of the liquid.

[0015] As a preferred embodiment, a probe head is detachably connected to the bottom of the probe shaft, and the axis of the probe head coincides with the axis of the probe shaft.

[0016] The probe head can isolate the probe shaft from the liquid to be tested. The detachable design allows the probe head to be replaced for each test, avoiding contamination of the liquid to be tested with liquid from the previous test, which would affect the accuracy of the test results.

[0017] As a preferred embodiment, the probe head covers the bottom of the probe shaft.

[0018] This encapsulation design improves the transmission effect of the probe head to the probe shaft, further ensuring accuracy.

[0019] As a preferred embodiment, the probe head is provided with a circumferential extension.

[0020] The circumferential extension can serve as a container cap, facilitating stable placement of the device on liquid containers. It also allows for easy installation and removal of the probe head. A method for testing the viscoelasticity of liquids based on magnetic force detection, characterized in that it employs a liquid viscoelasticity testing device based on magnetic force detection as described in any one of claims 1-7, specifically comprising: S1: Add a measured amount of the liquid to be tested to the liquid container and drive the liquid container to rotate around the central axis; S2: The liquid to be tested is driven to rotate, which in turn drives the probe shaft to rotate, and in turn drives the radial magnetic block to rotate; S3: Relative rotation occurs between the radial magnetic block and the magnetized component, and an angle is generated between the radial magnetic block and the magnetized component; S4: Obtain the specific angle value of the current included angle through the angle detection module. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a liquid viscoelasticity testing device based on magnetic force detection; Figure 2 This is a logic diagram of a liquid viscoelasticity testing method based on magnetic force detection. Detailed Implementation

[0022] The technical solution of this application will be further described in detail below through specific embodiments: The attached figures are labeled as follows: 1. Magnetized component; 2. Radial magnetic block; 3. First bearing; 4. Second bearing; 5. Probe shaft; 6. Circumferential extension; 7. Liquid container; 8. Liquid to be tested; 9. S-level magnetic attraction; 10. N-level magnetic attraction.

[0023] 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.

[0024] 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.

[0025] Example 1 like Figure 1 The illustrated liquid viscoelasticity testing device based on magnetic force detection includes a probe shaft 5, bearings, a channel body, radial magnets 2, a magnetizing element 1, and a liquid container 7. The channel body is a supporting component connecting various parts. The probe shaft 5 is the detection component used to detect the viscoelastic force of the liquid. The probe shaft 5 has an axisymmetric shape and is disposed inside the channel body. The axis of the probe shaft 5 coincides with the axis of the channel body. Several bearings are spaced apart on the shaft of the probe shaft 5. The probe shaft 5 is rotatably connected to the channel body through the bearings, ensuring that the probe shaft 5 is uniformly supported and stably fixed. This embodiment includes a first bearing 3 and a second bearing 4. The probe shaft 5 is made of a non-magnetic material; aluminum is preferred in this embodiment. The liquid container 7 can be a beaker, test tube, or other container.

[0026] A magnetic block seat is fixedly connected to the top of the probe shaft 5, and a radial magnetic block 2 is fixedly connected to the magnetic block seat. A magnetizing element 1 is disposed above the radial magnetic block 2, and the magnetizing element 1 is magnetized by the radial magnetic block 2. In this embodiment, the magnetizing element 1 is preferably a thin silicon steel sheet. The magnetizing element 1 is fixedly connected to the channel body. Both the radial magnetic block 2 and the magnetizing element 1 are symmetrical in shape, and their axes are installed coincidentally. The radial magnetic block 2 and the magnetizing element 1 maintain a certain distance. In this embodiment, the radial magnetic block 2 is the core component that provides magnetic force, and it is preferably made of radial magnet steel, preferably cylindrical in shape. The radial magnetic block 2 and the magnetizing element 1 can generate an S-level magnetic attraction force 9 and an N-level magnetic attraction force 10, and the direction of the magnetic attraction force is as follows: Figure 1 As shown, the horizontal components of the force are equal in magnitude but opposite in direction.

[0027] The main body of the channel is also equipped with an angle detection module, which is used to detect the rotation angle of the probe shaft 5. Different rotation angles correspond to different viscosity values, so as to realize the measurement of the viscoelasticity of the liquid 8 under test. The angle detection module can use an angle detection sensor to measure the angle of the probe shaft 5.

[0028] like Figure 2 The following are the specific steps of a liquid viscoelasticity test method based on magnetic force detection: S1: Add a measured amount of the liquid to be tested 8 to the liquid container 7 and drive the liquid container 7 to rotate around the central axis.

[0029] S2: Since the test liquid 8 has viscoelasticity, it will rotate along with the liquid container 7, thereby driving the probe shaft 5 to rotate. Since the probe shaft 5 is fixedly connected to the radial magnetic block 2, the radial magnetic block 2 can also be driven to rotate.

[0030] S3: The radial magnetic block 2 rotates relative to the magnetized component 1, and an angle is generated between the radial magnetic block 2 and the magnetized component 1. The direction of the magnetic attraction changes, that is, a torque is formed in the horizontal direction relative to the axis direction. The larger the angle between the radial magnetic block 2 and the magnetized component 1, the greater the torque. When the torque is equal to the viscoelastic torque of the liquid 8 to be tested, the angle reaches its maximum.

[0031] S4: Obtain the specific angle value of the current included angle through the angle detection module. Different angle values ​​correspond to different viscoelasticity, so as to realize the measurement of the viscoelasticity of the liquid under test.

[0032] Example 2 The key technical difference between this embodiment and Embodiment 1 lies in the fact that a probe head is detachably connected to the bottom of the probe shaft 5. In this embodiment, to ensure that the probe head can effectively drive the probe shaft 5 to rotate synchronously, the probe head covers the bottom of the probe shaft 5, and the axis of the probe head coincides with the axis of the probe shaft 5. The probe head can separate the probe shaft 5 from the liquid to be tested 8, preventing the probe shaft 5 from contacting the liquid to be tested 8 and being corroded or contaminated, thus further ensuring the measurement accuracy of this device. At the same time, by replacing the probe head when collecting blood coagulation viscoelasticity or other similar liquids that require standardized operation, contamination between different liquids to be tested can also be avoided.

[0033] A method for testing the viscoelasticity of liquids based on magnetic force detection, which utilizes the aforementioned technical solution.

[0034] Example 3 The technical feature that distinguishes this embodiment from Embodiment 2 is that the top of the probe head is provided with a circumferential extension 6. The circumferential extension 6 can serve as a container cover, making it easy for the device to be stably placed on the liquid container 7. At the same time, the circumferential extension 6 also facilitates the installation and removal of the probe head. In actual use, when the liquid to be tested 8 is added to the liquid container 7, the probe shaft 5 is inserted into the liquid container 7. It should be ensured that the extension 6 does not contact the liquid container 7, so as to avoid friction caused by the extension 6 contacting the liquid container 7 when the liquid container 7 rotates, which would affect the measurement accuracy of the viscoelasticity of the liquid to be tested 8.

[0035] A method for testing the viscoelasticity of liquids based on magnetic force detection, which utilizes the aforementioned technical solution.

[0036] 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 liquid viscoelasticity testing device based on magnetic force detection, characterized by: It includes a probe shaft, a corner detection module, and a liquid container; a radial magnetic block is fixedly connected to the top of the probe shaft, and a magnetized component is set above the radial magnetic block. The probe shaft, the radial magnetic block, and the magnetized component are all symmetrical in shape and their axes coincide. The radial magnetic block and the magnetized component maintain a distance.

2. The liquid viscoelasticity testing device based on magnetic force detection according to claim 1, characterized by: It also includes a channel body, with the probe shaft set inside the channel body and its axis coinciding with the axis of the channel body, and the magnetizing element fixedly connected to the channel body.

3. A liquid viscoelasticity testing device based on magnetic force detection according to claim 2, characterized by: The probe shaft is provided with several bearings at intervals, and the probe shaft is rotatably connected to the channel body through the bearings.

4. The device for testing the viscoelasticity of a liquid based on magnetic detection according to claim 1, characterized in that: The radial magnetic block is a radial magnet and is cylindrical in shape.

5. The device of claim 1, wherein: The probe head is detachably connected to the bottom of the probe shaft, and the axis of the probe head coincides with the axis of the probe shaft.

6. A liquid viscoelasticity testing device based on magnetic force detection according to claim 5, characterized by: The probe head covers the bottom of the probe shaft.

7. A liquid viscoelasticity testing device based on magnetic force detection according to claim 6, characterized in that: The probe head is provided with a circumferential extension.

8. A method for testing the viscoelasticity of liquids based on magnetic force detection, characterized in that: The liquid viscoelasticity testing device based on magnetic force detection as described in any one of claims 1-7 specifically includes: S1: Add a measured amount of the liquid to be tested to the liquid container and drive the liquid container to rotate around the central axis; S2: The liquid to be tested is driven to rotate, which in turn drives the probe shaft to rotate, and in turn drives the radial magnetic block to rotate; S3: Relative rotation occurs between the radial magnetic block and the magnetized component, and an angle is generated between the radial magnetic block and the magnetized component; S4: Obtain the specific angle value of the current included angle through the angle detection module.

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