A cone-plate rotational viscometer for testing small sample sizes

Abstract

This invention proposes a cone-plate rotational viscometer capable of testing small quantities of samples, relating to the field of rotational viscometer technology. It includes a base assembly and a rotational detection assembly. One end of the rotational detection assembly and the base assembly form a vertically sliding connection that allows for lifting and lowering. The other end of the base assembly has a sample placement section. The rotational detection assembly has a rotational detection head positioned above and aligned with the sample placement section. Both the sample placement section and the rotational detection head are electrically connected to the rotational detection assembly. Lowering the rotational detection assembly allows the rotational detection head to conform to the surface of the sample placement section based on its own weight. This cone-plate rotational viscometer, capable of testing small quantities of samples, can effectively detect the viscosity of small amounts of liquid, achieving the original detection effect while saving the amount of liquid to be tested.

Description

Technical Field

[0001] This utility model relates to the field of rotational viscometer technology, and in particular to a cone-plate rotational viscometer capable of testing small quantities of samples. Background Technology

[0002] With scientific advancements and improvements in industrial production, measuring the viscosity of substances has become crucial. Rotational viscometers can be used to determine the viscosity and flow behavior of polymer liquids. Since most polymers are processed and molded under viscous flow conditions, understanding the properties of viscous flow is extremely important in polymer manufacturing processes.

[0003] The digital rotational viscometer can plot rheological curves based on multi-point measurements, determine the flow pattern of the liquid during flow, and select appropriate calculation formulas for the measurement of non-Newtonian fluids. It is used for the research and analysis of rheological parameters of drilling fluids in the field. At the same time, it can measure a series of technical parameters such as dynamic and static shear force, flow index, and consistency coefficient, which is beneficial to the needs of safe, rapid, and scientific drilling. It features convenient operation, accurate testing, and a large measurement range.

[0004] Currently, rotational viscometers all use a rotating measuring shaft that extends into the liquid in the measuring cup. The viscosity value of the liquid is then reflected by obtaining the rotational resistance of the measuring shaft. For example, a digital rotational viscometer with patent number CN212844855U uses a rotating measuring shaft that extends into the liquid in the measuring cup to rotate for measurement. This method requires a preset amount of liquid to be measured to be filled into the measuring cup, which is not conducive to saving the amount of liquid to be measured.

[0005] Therefore, it is necessary to propose a cone-plate rotational viscometer that can test small amounts of samples to detect the viscosity of small amounts of liquid, achieving the original detection effect while saving the amount of liquid to be tested. Utility Model Content

[0006] To address the aforementioned issues, this invention proposes a cone-plate rotational viscometer capable of testing small quantities of liquids, achieving the same testing results while reducing the amount of liquid to be tested.

[0007] This utility model is achieved through the following technical solution:

[0008] This invention proposes a cone-plate rotational viscometer for testing small quantities of samples, comprising a base assembly and a rotational detection assembly. The rotational detection assembly is vertically and slidably connected to one end of the base assembly, and the other end of the base assembly is provided with a sample placement part. The rotational detection assembly is provided with a rotational detection head, which is located above and aligned with the sample placement part. Both the sample placement part and the rotational detection head are electrically connected to the rotational detection assembly. Lowering the rotational detection assembly allows the rotational detection head to conform to the surface of the sample placement part based on its own weight.

[0009] Furthermore, the rotating detection head includes a first support frame, a detection circuit board, a motor, a first detection element, a second detection element, and a sample bonding element. The first support frame is fixedly connected to the rotating detection assembly, the motor is fixedly connected to the first support frame, the detection circuit board is fixedly connected to one side of the support frame, the first detection element is coaxially fixedly connected to the rotating shaft of the motor, one side of the second detection element is elastically fixedly connected to one side of the first detection element, the second detection element is coaxially arranged with the first detection element, the rotation center of the second detection element passes through the first support frame, the sample bonding element is coaxially fixedly connected with the second detection element, the sample bonding element faces the sample placement part, the motor and the detection circuit board are both electrically connected to the rotating detection assembly, and when the motor drives the sample bonding element to rotate, the detection circuit board is used to detect the deformation distance of the second detection element relative to the first detection element.

[0010] Furthermore, the second detection component includes a detection turntable, a planar spiral spring, and a connecting shaft. The detection turntable and the planar spiral spring are stacked on top of each other. One end of the connecting shaft passes through the rotation centers of the planar spiral spring and the detection turntable in sequence. The detection turntable and the planar spiral spring are both fixedly connected to the connecting shaft. The other end of the connecting shaft passes through the first support frame. One end of the sample bonding component is coaxially fixedly connected to the other end of the connecting shaft. One side of the planar spiral spring is fixedly connected to one side of the first detection component.

[0011] Furthermore, a connecting plate is provided on one side of the planar spiral spring, and a connecting post is provided on one side of the first detection element, with the connecting plate and the connecting post being fixedly connected.

[0012] Furthermore, the detection circuit board is provided with a first infrared detection switch and a second infrared detection switch. A first detection post is provided on one side of the first detection element, and a second detection post is provided on one side of the detection turntable. The first detection post is aligned with the first infrared detection switch at the same height, and the second detection post is aligned with the second infrared detection switch at the same height.

[0013] Furthermore, the rotating detection head also includes a counterweight, the connecting shaft passes through the counterweight and is fixedly connected to the counterweight, and the counterweight is located below the planar spiral spring.

[0014] Furthermore, the first detection element has a relief groove at its center, and one end of the connecting shaft is aligned with the relief groove and extends into the relief groove.

[0015] Furthermore, the rotating detection assembly includes a housing, a touch screen, a main control circuit board, a lifting and locking mechanism, a rotating handle, and an elastic element. One end of the base assembly is provided with a sliding rod, and the housing is slidably connected to the sliding rod. The touch screen is fixedly connected to one side of the housing. The main control circuit board is fixedly connected inside the housing and electrically connected to the touch screen, the rotating detection head, and the sample placement part, respectively. A second support frame is provided inside the housing. A support block is provided on the sliding rod. The sliding rod passes through the elastic element, one end of the elastic element abuts against the support block, and the other end of the elastic element abuts against the second support frame. One end of the rotating handle is rotatably connected to the housing, and the other end of the rotating handle extends outside the housing. One end of the lifting and locking mechanism is fixedly connected to one end of the rotating handle, and the other end of the lifting and locking mechanism is fixedly connected to one side of the support block.

[0016] Furthermore, the lifting and locking mechanism includes a first connecting block, a connecting rod, and a second connecting block. One end of the first connecting block is fixedly connected to one end of the rotating handle, one end of the connecting rod is rotatably connected to the other end of the first connecting block, the other end of the connecting rod is rotatably connected to one end of the second connecting block, and the other end of the second connecting block is fixedly connected to one side of the support block.

[0017] Furthermore, the sample placement section includes a sample placement plane, a thermoelectric cooler, a heat sink, a cooling fan, and a control board. The sample placement plane is fixedly connected to the upper surface of the base assembly and located below the rotating detection head. One end of the thermoelectric cooler is fixedly attached to the bottom of the sample placement plane, and the heat sink is fixedly attached to the other end of the thermoelectric cooler. The cooling fan is fixedly connected to the base assembly and located below the heat sink, with the cooling fan facing the heat sink. The control board is fixedly connected inside the base assembly and electrically connected to the thermoelectric cooler, the cooling fan, and the rotating detection assembly, respectively.

[0018] The beneficial effects of this utility model are:

[0019] This invention employs a rotating detection component that moves up and down relative to the base component to drive the rotating detection head to move up and down. When viscosity testing of the liquid to be tested is required, a small amount of the liquid is dripped onto the surface of the sample placement area. Then, the rotating detection component is lowered, causing the rotating detection head to descend towards the liquid and, based on its own weight, adhere to the surface of the sample placement area. This ensures a sufficient amount of liquid to be tested exists between the rotating detection head and the sample placement area. After the rotating detection head rotates for a preset time, the viscosity of the liquid to be tested can be reflected by the rotational resistance value of the rotating detection head, thereby detecting the viscosity of the liquid to be tested. This not only saves on the amount of liquid to be tested but is also convenient and quick. In summary, this cone-plate rotational viscometer, capable of testing small amounts of samples, can effectively detect the viscosity of small amounts of liquid, achieving the original detection effect while saving on the amount of liquid to be tested. Attached Figure Description

[0020] Figure 1 This is an internal schematic diagram of the cone-plate rotational viscometer of this utility model, which can test a small number of samples.

[0021] Figure 2 for Figure 1 A magnified view of a portion labeled A;

[0022] Figure 3 This is another internal view of the cone-plate rotational viscometer of this invention, which can test a small number of samples.

[0023] Figure 4 This is a cross-sectional view of the cone-plate rotational viscometer of this invention, which can test small quantities of samples.

[0024] Figure 5 This is a schematic diagram of the lifting and locking mechanism of the cone-plate rotary viscometer of this utility model when it is relaxed.

[0025] Figure 6 An exploded view of the second testing component of the cone-plate rotational viscometer of this invention, which can test small quantities of samples.

[0026] Figure 7 This is a schematic diagram of the detection circuit board of the cone-plate rotational viscometer of this utility model, which can test a small number of samples.

[0027] Figure 8 This is a circuit block diagram of the cone-plate rotational viscometer of this invention, which can test a small number of samples.

[0028] The attached figures are labeled as follows:

[0029] Base assembly 1, sample placement part 11, sample placement plane 111, semiconductor cooling chip 112, heat sink 113, cooling fan 114, control board 115, sliding rod 12, support block 121.

[0030] Rotary detection assembly 2, rotary detection head 21, first support frame 211, detection circuit board 212, first infrared detection switch 2121, second infrared detection switch 2122, motor 213, first detection component 214, connecting column 2141, first detection column 2142, clearance groove 2143, second detection component 215, detection turntable 2151, second detection column 21511, flat spiral spring 2152, connecting plate 21521, connecting shaft 2153, sample bonding component 216, counterweight component 217, outer shell 201, second support frame 2011, connecting boss 2012, touch screen display 202, main control circuit board 203, lifting and locking mechanism 204, rotating handle 205, elastic component 206. Detailed Implementation

[0031] To more clearly and completely illustrate the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, will further explain this utility model.

[0032] Please refer to Figures 1-8 This utility model proposes a cone-plate rotational viscometer for testing small quantities of samples, including a base assembly 1 and a rotational detection assembly 2. The rotational detection assembly 2 and one end of the base assembly 1 form a vertically sliding connection that allows for lifting and lowering. The other end of the base assembly 1 is provided with a sample placement part 11. The rotational detection assembly 2 is provided with a rotational detection head 21, which is located above and aligned with the sample placement part 11. Both the sample placement part 11 and the rotational detection head 21 are electrically connected to the rotational detection assembly 2. Lowering the rotational detection assembly 2 allows the rotational detection head 21 to adhere to the surface of the sample placement part 11 based on its own weight.

[0033] In this embodiment, the rotating detection component 2 is raised and lowered relative to the base component 1 to drive the rotating detection head 21 to rise and fall. The raising and lowering can be manual or electric. When viscosity testing of the liquid to be tested is required, the rotating detection component 2 is raised to its maximum height, and then a small amount of the liquid to be tested is dripped onto the surface of the sample placement part 11. The amount of dripping is 1 to 3 drops, depending on the contact area between the rotating detection head 21 and the liquid to be tested. The sample placement part 11 can be heated or cooled according to preset heating or cooling commands to reach the required testing temperature for holding the liquid. Then, the rotating detection component 2 is lowered, causing the rotating detection head 21 to descend towards the liquid to be tested and, based on its own weight, to adhere to the surface of the sample placement part 11. The rotating detection head 21 can move up and down a short distance within the rotating detection component 2. When the rotating detection component 2 descends to a preset height, the rotating detection head 21 presses down on the liquid to be tested under its own weight, so that there is a sufficient amount of liquid to be tested between the rotating detection head 21 and the sample placement part 11. That is, the liquid is compressed into a flat shape and fills the space between the rotating detection head 21 and the sample placement part 11, and a small portion of the liquid to be tested overflows outward. After the rotating detection head 21 rotates for a preset time, the viscosity of the liquid to be tested can be reflected by the rotational resistance value of the rotating detection head 21, thereby detecting the viscosity of the liquid to be tested. After the test is completed, it is only necessary to wipe away the residual liquid on the sample placement part 11 and the residual liquid on the rotating detection head 21. This not only saves the amount of liquid to be tested, but is also convenient and quick.

[0034] In summary, the cone-plate rotational viscometer, which can test small quantities of samples, can effectively detect the viscosity of small amounts of liquid, achieving the same detection effect while saving the amount of liquid to be tested.

[0035] In this embodiment, the rotating detection head 21 includes a first support frame 211, a detection circuit board 212, a motor 213, a first detection element 214, a second detection element 215, and a sample bonding element 216. The first support frame 211 is fixedly connected to the rotating detection assembly 2, the motor 213 is fixedly connected to the support frame 211, the detection circuit board 212 is fixedly connected to one side of the support frame 211, the first detection element 214 is coaxially fixedly connected to the rotating shaft of the motor 213, one side of the second detection element 215 is elastically fixedly connected to one side of the first detection element 214, and the second detection element 215 is coaxial with the first detection element 214. The rotation center of the second detection element 215 passes through the first support frame 211. The sample bonding element 216 is coaxially fixedly connected to the second detection element 215, with the sample bonding element 216 facing the sample placement part 11. The motor 213 and the detection circuit board 212 are both electrically connected to the rotating detection assembly 2. When the motor 213 drives the sample bonding element 216 to rotate, the detection circuit board 212 is used to detect the deformation distance of the second detection element 215 relative to the first detection element 214. When the liquid to be tested is being tested, the rotating detection assembly 2 descends, causing the rotating detection head 21 to descend, so that the sample bonding element 216 is in contact with the liquid to be tested. Because the sample bonding component 216 is coaxially fixedly connected to the second detection component 215, and one side of the second detection component 215 is elastically fixedly connected to one side of the first detection component 214, the sample bonding component 216 can move up and down a small distance relative to the rotating shaft of the motor 213. This allows the sample bonding component 216 to press against the liquid to be tested by its own weight. After the rotating detection component 2 issues a rotation command to the motor 213, the motor 213 rotates, simultaneously driving the first detection component 214, the second detection component 215, and the sample bonding component 216 to rotate. The sample bonding component 216 is then subjected to the liquid to be tested. The resistance acts on the second detection element 215 in the form of torque, causing the second detection element 215 to deform. The first detection element 214 is directly fixed to the shaft of the motor 213 and does not deform. Since the second detection element 215 has deformed, when one side of the first detection element 214 and one side of the deformed second detection element 215 pass through the detection circuit board 212, the relative position of one side of the deformed second detection element 215 and one side of the first detection element 214 can be determined, and thus the deformation of the second detection element 215 can be determined. By referring to the data in the preset deformation table, the viscosity of the liquid to be tested can be determined.

[0036] In this embodiment, the second detection element 215 includes a detection turntable 2151, a planar spiral spring 2152, and a connecting shaft 2153. The detection turntable 2151 and the planar spiral spring 2152 are stacked. One end of the connecting shaft 2153 passes through the rotation centers of the planar spiral spring 2152 and the detection turntable 2151 in sequence. The detection turntable 2151 and the planar spiral spring 2152 are both fixedly connected to the connecting shaft 2153. The other end of the connecting shaft 2153 passes through the first support frame 211. One end of the sample bonding element 216 is coaxially fixedly connected to the other end of the connecting shaft 2153. One side of the planar spiral spring 2152 is fixedly connected to one side of the first detection element 214. Fixed connection; when the first detection element 214 rotates, it will drive the planar spiral spring 2152 to rotate. Since the detection turntable 2151 and the planar spiral spring 2152 are integrated through the connecting shaft 2153, the detection turntable 2151 will also rotate. When the sample bonding element 216 is subjected to the viscous resistance of the liquid to be tested, since the torque of the motor 213 remains unchanged, the planar spiral spring 2152 will deform, so that the measured position of the detection turntable 2151 and the measured position of the first detection element 214 are offset at an angle on the horizontal plane. This angle will vary depending on the viscosity of the liquid to be tested. The greater the viscosity of the liquid to be tested, the greater the offset angle.

[0037] In this embodiment, a connecting plate 21521 is provided on one side of the planar spiral spring 2152, and a connecting post 2141 is provided on one side of the first detection element 214. The connecting plate 21521 and the connecting post 2141 are fixedly connected. The connecting plate 21521 is located at the end of the planar spiral spring 2152. When the first detection element 214 rotates, the connecting post 2141 drives the planar spiral spring 2152 to rotate through the connecting plate 21521. When the sample contact element 216 is subjected to the viscous resistance of the liquid to be tested, the planar spiral spring 2152 is forced to open or close in a plane, which delays the rotation of the detection turntable 2151, thereby causing the measured position of the detection turntable 2151 to be offset from the measured position of the first detection element 214 at an angle on the horizontal plane.

[0038] In this embodiment, the detection circuit board 212 is provided with a first infrared detection switch 2121 and a second infrared detection switch 2122. A first detection post 2142 is provided on one side of the first detection element 214, and a second detection post 21511 is provided on one side of the detection turntable 2151. The first detection post 2142 is aligned with the first infrared detection switch 2121 at the same height, and the second detection post 21511 is aligned with the second infrared detection switch 2122 at the same height. When the first detection element 214 drives the detection turntable 2151 to rotate via the planar spiral spring 2152, the first detection post 2142 and the second detection post 21511 rotate simultaneously. The first detection post 2142 and the second detection post 21511 can be pre-staggered by 90 degrees in the plane. When there is no liquid to be tested, since the speed of the motor 213 is constant, the first detection post 2142 and the second detection post 21511 pass through the first infrared detection switch 2121 and the second infrared detection switch 2122 respectively. The time for the detection switch 2122 is constant. For example, after the first detection column 2142 passes the first infrared detection switch 2121, the second detection column 21511 passes the second infrared detection switch 2122 after an interval of 0.1s. That is, in the state without the liquid to be tested, 0.1s is the idling time. When the planar spiral spring 2152 deforms, the angle between the first detection column 2142 and the second detection column 21511 will be greater than 90 degrees or less than 90 degrees. This makes the time for the first detection column 2142 and the second detection column 21511 to pass the first infrared detection switch 2121 and the second infrared detection switch 2122 respectively greater than 0.1s or less than 0.1s. That is, the deformation of the planar spiral spring 2152 is different, and the interval time corresponding to the deformation is different. The corresponding interval time value is compared with a preset comparison table, and finally the viscosity value of the liquid to be tested is obtained. The comparison process is carried out by computer algorithm.

[0039] In this embodiment, the rotating detection head 21 also includes a counterweight 217. The connecting shaft 2153 passes through the counterweight 217 and is fixedly connected to the counterweight 217. The counterweight 217 is located below the planar spiral spring 2152. The counterweight 217 is used to increase the downward pressure of the sample bonding member 216, so that the liquid to be tested can be pressed into the thinnest possible layer, thereby saving the amount of liquid to be tested.

[0040] In this embodiment, the center of the first detection element 214 is provided with a relief groove 2143, and one end of the connecting shaft 2153 is aligned with the relief groove 2143 and extends into the relief groove 2143. When the rotating detection component 2 is lowered, the liquid to be tested is not pressed down by the downward stroke, but by the weight of the rotating detection head 21 itself. The relief groove 2143 is provided to allow the connecting shaft 2153 to have upward movement space, which serves as a buffer space when pressing down, and avoids the sample placement part 11 from being subjected to excessive pressure.

[0041] In this embodiment, the rotating detection assembly 2 includes a housing 201, a touch screen 202, a main control circuit board 203, a lifting and locking mechanism 204, a rotating handle 205, and an elastic element 206. One end of the base assembly 1 is provided with a sliding rod 12, and the housing 201 and the sliding rod 12 are slidably connected. One end of the rotating detection head 21 is fixedly connected inside the housing 201, and the other end of the rotating detection head 21 extends out of the housing 201, i.e., the first support frame 211 is fixedly connected inside the housing 201. The sample bonding component 216 extends out of the housing 201. The touch screen 202 is fixedly connected to one side of the housing 201. The main control circuit board 203 is fixedly connected inside the housing 201 and is connected to the touch screen 202 and the rotating detection head 206 respectively. The head 21 and sample placement part 11 are electrically connected. The main control circuit board 203 is powered by an external mains power supply. A second support frame 2011 is provided inside the outer shell 201. A support block 121 is provided on the sliding rod 12. The sliding rod 12 passes through the elastic member 206. One end of the elastic member 206 abuts against the support block 121, and the other end of the elastic member 206 abuts against the second support frame 211. One end of the rotating handle 205 is rotatably connected to the outer shell 201. A connecting boss 2012 is provided inside the outer shell 201. A bearing is provided inside the connecting boss 2012. One end of the rotating handle 205 is inserted into the bearing to form a rotatable connection. The other end of the rotating handle 205 extends out of the outer shell 201. One end of the lifting locking mechanism 204 is connected to the rotating handle 205. One end is fixedly connected, and the other end of the lifting and locking mechanism 204 is fixedly connected to one side of the support block 121. When the rotating detection component 2 is lowered, the rotating handle 205 is rotated forward by a preset angle, causing the rotating handle 205 to drive one end of the lifting and locking mechanism 204 to rotate forward by a preset angle, thereby causing the lifting and locking mechanism 204 to expand, pushing the outer shell 201 downward by a preset distance. When the outer shell 201 is lowered, the elastic element 206 is compressed, and the expanded lifting and locking mechanism 204 keeps the elastic element 206 in a compressed state, so that the outer shell 201 is kept at the lowest position when it is lowered to the lowest height. At this time, the rotating detection head 21 is attached to the surface of the sample placement part 11, and the sample is to be tested. After the liquid detection is completed, when the rotating detection component 2 needs to be raised, the rotating handle 205 is rotated in the opposite direction by a preset angle. This causes the rotating handle 205 to drive one end of the lifting locking mechanism 204 to rotate in the opposite direction by a preset angle, thereby causing the lifting locking mechanism 204 to retract and pull the outer shell 201 upward by a preset distance. When the outer shell 201 rises, the elastic element 206 that was originally squeezed expands. The expansion force acts on the lifting locking mechanism 204 to accelerate the contraction of the lifting locking mechanism 204. The contracted lifting locking mechanism 204 and the expanded elastic element 206 together keep the outer shell 201 at the highest position, so that the outer shell 201 stays at the highest position when it is lowered to the highest position and does not fall.Users can operate the operating parameters on the rotating detection assembly 2 via the touch display screen 202. For example, they can set the temperature value of the sample placement section 11 and view the detection parameters of the rotating detection head 21 for the liquid under test.

[0042] In this embodiment, the lifting and locking mechanism 204 includes a first connecting block 2041, a connecting rod 2042, and a second connecting block 2043. One end of the first connecting block 2041 is fixedly connected to one end of the rotating handle 205. One end of the connecting rod 2042 is rotatably connected to the other end of the first connecting block 2041, and the other end of the connecting rod 2042 is rotatably connected to one end of the second connecting block 2043. The other end of the second connecting block 2043 is fixedly connected to one side of the support block 121. When the lifting and locking mechanism 204 is placed on a flat surface for viewing, when the rotating handle 205 is rotated forward by a preset angle (forward rotation is clockwise, for example, 80 degrees), the connecting end of the first connecting block 2041 rotates clockwise by 80 degrees around the rotating handle 205. This pries the first connecting block 2041, causing the connecting rod 2042 to push upward, thereby pushing the second connecting block 2043. 043 moves upward. Since the support block 121 is fixed, the outer shell 201 moves downward. At this time, the second support frame 2011 also moves downward, pressing the elastic element 206. After the first connecting block 2041 rotates 80 degrees clockwise, the three points of the connection end of the first connecting block 2041 and the rotating handle 205, the connection end of the first connecting block 2041 and the connecting rod 2042, and the connection end of the connecting rod 2042 and the second connecting block 2043 form an obtuse triangle. One side of the first connecting block 2041 abuts against the inner side of the outer shell 201, so that the first connecting block 2041 cannot continue to rotate. This prevents the lifting locking mechanism 204 from retracting without external force, thus locking the outer shell 201 after it is pressed down. That is, the outer shell 201 will not rise when no clockwise force is applied to the rotating handle 205, which improves the ease of pressing and positioning the rotating detection head 21.

[0043] In this embodiment, the sample placement section 11 includes a sample placement plane 111, a thermoelectric cooler 112, a heat sink 113, a cooling fan 114, and a control board 115. The sample placement plane 111 is fixedly connected to the upper surface of the base assembly 1 and located below the rotating detection head 21. One end of the thermoelectric cooler 112 is fixedly attached to the bottom of the sample placement plane 111, and the heat sink 113 is fixedly attached to the other end of the thermoelectric cooler 112. The cooling fan 114 is fixedly connected to the base assembly 1 and located below the rotating detection head 21. Below the heat sink 113, the cooling fan 114 faces the heat sink 113. The control board 115 is fixedly connected to the base assembly 1 and electrically connected to the semiconductor cooling chip 112, the cooling fan 114, and the rotary detection assembly 2. The sample placement plane 111 is made of metal and has a relatively smooth upper surface to reduce friction with the rotary detection head 21, so as to facilitate the rotation detection of the liquid to be tested. Before testing the liquid to be tested, the liquid to be tested needs to be dripped onto the upper surface of the sample placement plane 111, and then the detection is performed according to the liquid to be tested. To meet testing requirements, a preset temperature can be set for the sample placement plane 111. This can be either cooling down or heating up to the preset temperature, within the range of 5–75 degrees Celsius. Alternatively, the temperature range can be controlled within 50–230 degrees Celsius by replacing the thermoelectric cooler 112 with a heating element. This temperature range is for another model, in which case the heat sink 113 and cooling fan 114 are not needed to dissipate heat from the heating element. When cooling is required, the side of the thermoelectric cooler 112 that is in contact with the sample placement plane 111 will cool to the preset temperature. The other side of the thermoelectric cooler 112 heats up and is cooled by the cooling fan 114 blowing air onto the heat sink 113. When heating is required, the side of the thermoelectric cooler 112 that is in contact with the sample placement plane 111 heats up to a preset temperature, while the other side of the thermoelectric cooler 112 cools down and is cooled by the cooling fan 114 blowing air onto the heat sink 113. The sub-control board 115 can receive the operation instructions from the main control circuit board 203 and send them to the thermoelectric cooler 112 and the cooling fan 114 respectively for operation.

[0044] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A cone and plate rotational viscometer for small sample testing, characterized by, The device includes a base assembly and a rotating detection assembly. The rotating detection assembly is vertically slidably connected to one end of the base assembly, and the other end of the base assembly is provided with a sample placement part. The rotating detection assembly is provided with a rotating detection head, which is located above and aligned with the sample placement part. Both the sample placement part and the rotating detection head are electrically connected to the rotating detection assembly. Lowering the rotating detection assembly allows the rotating detection head to conform to the surface of the sample placement part based on its own weight.

2. The low sample volume cone and plate rotational viscometer of claim 1, wherein, The rotating detection head includes a first support frame, a detection circuit board, a motor, a first detection element, a second detection element, and a sample bonding element. The first support frame is fixedly connected to the rotating detection assembly, the motor is fixedly connected to the first support frame, and the detection circuit board is fixedly connected to one side of the first support frame. The first detection element is coaxially fixedly connected to the rotating shaft of the motor. One side of the second detection element is elastically fixedly connected to one side of the first detection element. The second detection element is coaxially arranged with the first detection element, and the rotation center of the second detection element passes through the first support frame. The sample bonding element is coaxially fixedly connected to the second detection element and faces the sample placement part. The motor and the detection circuit board are both electrically connected to the rotating detection assembly. When the motor drives the sample bonding element to rotate, the detection circuit board is used to detect the deformation distance of the second detection element relative to the first detection element.

3. The low sample volume cone and plate rotational viscometer of claim 2, wherein, The second detection component includes a detection turntable, a planar spiral spring, and a connecting shaft. The detection turntable and the planar spiral spring are stacked on top of each other. One end of the connecting shaft passes through the rotation centers of the planar spiral spring and the detection turntable in sequence. The detection turntable and the planar spiral spring are both fixedly connected to the connecting shaft. The other end of the connecting shaft passes through the first support frame. One end of the sample bonding component is coaxially fixedly connected to the other end of the connecting shaft. One side of the planar spiral spring is fixedly connected to one side of the first detection component.

4. The low sample volume cone and plate rotational viscometer of claim 3, wherein, The planar spiral spring has a connecting plate on one side, and the first detection piece has a connecting post on one side. The connecting plate and the connecting post are fixedly connected.

5. The low sample volume cone and plate rotational viscometer of claim 3, wherein, The detection circuit board is provided with a first infrared detection switch and a second infrared detection switch. A first detection post is provided on one side of the first detection element, and a second detection post is provided on one side of the detection turntable. The first detection post is aligned with the first infrared detection switch at the same height, and the second detection post is aligned with the second infrared detection switch at the same height.

6. The low sample volume cone and plate rotary viscometer of claim 3, wherein, The rotating detection head also includes a counterweight, and the connecting shaft passes through the counterweight and is fixedly connected to the counterweight. The counterweight is located below the planar spiral spring.

7. The low sample volume cone and plate rotary viscometer of claim 3, wherein, The first detection component has a clearance groove at its center, and one end of the connecting shaft is aligned with the clearance groove and extends into the clearance groove.

8. The low sample volume cone and plate rotary viscometer of claim 1, wherein, The rotating detection assembly includes a housing, a touch screen, a main control circuit board, a lifting and locking mechanism, a rotating handle, and an elastic element. One end of the base assembly has a sliding rod, and the housing is slidably connected to the sliding rod. The touch screen is fixedly connected to one side of the housing. The main control circuit board is fixedly connected inside the housing and electrically connected to the touch screen, the rotating detection head, and the sample placement part. A second support frame is provided inside the housing. A support block is provided on the sliding rod. The sliding rod passes through the elastic element, with one end of the elastic element abutting against the second support frame and the other end abutting against the support frame. One end of the rotating handle is rotatably connected to the housing, and the other end extends outside the housing. One end of the lifting and locking mechanism is fixedly connected to one end of the rotating handle, and the other end is fixedly connected to one side of the support block.

9. The low sample volume cone and plate rotational viscometer of claim 8, wherein, The lifting and locking mechanism includes a first connecting block, a connecting rod, and a second connecting block. One end of the first connecting block is fixedly connected to one end of the rotating handle. One end of the connecting rod is rotatably connected to the other end of the first connecting block. The other end of the connecting rod is rotatably connected to one end of the second connecting block. The other end of the second connecting block is fixedly connected to one side of the support block.

10. The low sample volume cone and plate rotary viscometer of claim 1, wherein, The sample placement section includes a sample placement plane, a thermoelectric cooler, a heat sink, a cooling fan, and a control board. The sample placement plane is fixedly connected to the upper surface of the base assembly and located below the rotating detection head. One end of the thermoelectric cooler is fixedly attached to the bottom of the sample placement plane, and the heat sink is fixedly attached to the other end of the thermoelectric cooler. The cooling fan is fixedly connected to the base assembly and located below the heat sink, with the cooling fan facing the heat sink. The control board is fixedly connected inside the base assembly and electrically connected to the thermoelectric cooler, the cooling fan, and the rotating detection assembly, respectively.

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