Integrated measuring instrument for viscosity and density of melt

Abstract

The utility model discloses an integrated measuring instrument for melt viscosity and density. The measuring instrument comprises a vacuum chamber, an oscillation device, a density measuring assembly and a viscosity measuring assembly, wherein the density measuring assembly and the viscosity measuring assembly are arranged in the vacuum chamber; the oscillating device comprises a suspension fiber, a connecting rod and a driving element; two ends of the suspension fiber are respectively connected with the driving element and the density measuring assembly; one end of the connecting rod is hinged with the density measuring assembly, the other end of the connecting rod is fixed with the viscosity measuring assembly, and the density measuring assembly and the viscosity measuring assembly are respectively driven by the suspension wire and the connecting rod to do periodic torsional vibration motion. The density measurement assembly and the viscosity measurement assembly are connected into a whole by arranging the oscillation device, the density of the melt is calculated according to the density measurement assembly, and the viscosity of the melt is calculated according to motion data of the viscosity measurement assembly of the melt. Therefore, the viscosity and density of the melt can be measured at the same time through one device, and the cost and time for measuring the viscosity of the melt are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of viscosity and density testing equipment, and in particular to an integrated measuring instrument for melt viscosity and density. Background Technology

[0002] The high-temperature viscosity of a melt directly reflects the fluidity and thermodynamic properties of the melt material at high temperatures, and plays a decisive role in improving heat transfer efficiency and reducing flow resistance. The measurement of melt viscosity is indispensable in the development of high-temperature heat transfer and storage media materials for metal smelting, slag melting, glass ceramics, and new energy. Therefore, accurate melt viscosity measurement is very important.

[0003] High-temperature viscometers are generally used for measuring melt viscosity. There are many specifications for high-temperature viscometers, and the main methods for measuring high-temperature viscometers include rotary viscometers, capillary viscometers, and vibrating cup viscometers. The vibrating cup viscometer method is currently the main method for measuring the viscosity of high-temperature melts, offering advantages such as high measurement accuracy and ease of operation. However, existing devices that use the vibrating cup viscometer method (such as the measuring devices disclosed in patent applications CN102879302A or CN105891050A) only measure the kinematic viscosity of the melt. The required dynamic viscosity can only be obtained by separately measuring the melt density using a high-temperature densitometer and then calculating the required dynamic viscosity. This method of using two separate devices increases the cost and time required for measuring the viscosity of high-temperature melts. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes an integrated measuring instrument for melt viscosity and density.

[0005] The technical solution adopted by this utility model is as follows:

[0006] This application provides an integrated measuring instrument for melt viscosity and density, including a vacuum chamber, an oscillation device, a density measuring component, and a viscosity measuring component;

[0007] The density measuring component and the viscosity measuring component are respectively disposed in a vacuum chamber;

[0008] The oscillation device includes a suspension wire, a connecting rod, and a driving element. One end of the suspension wire is connected to the driving element, and the other end is connected to the density measurement component.

[0009] One end of the connecting rod is hinged to the density measuring component, and the other end is fixed to the viscosity measuring component, which is used to immerse itself in the melt.

[0010] When the driving element drives the suspension wire to rotate, the density measuring component and the viscosity measuring component respectively perform periodic torsional vibration motion under the drive of the suspension wire and the connecting rod.

[0011] This application integrates a density measurement component and a viscosity measurement component into a single unit using an oscillation device, placing them simultaneously within a vacuum chamber. Under the action of a driving element, both components undergo periodic torsional vibration. This allows the melt density to be calculated from the motion data of the density measurement component, and the melt viscosity to be calculated from the motion data of the viscosity measurement component. In other words, the integrated melt viscosity and density measuring instrument provided by this application allows for the simultaneous measurement of both melt viscosity and density using a single device, reducing the cost and time required for melt viscosity measurement.

[0012] Furthermore, the density measuring assembly includes a fixed body, a sliding block, an elastic element, and a sliding resistor;

[0013] The fixing body is used to fix the suspension wire, and the fixing body has a sliding groove;

[0014] The sliding block is slidably disposed on the slide groove;

[0015] One end of the elastic element is fixed to the fixed body, and the other end is fixed to the sliding block, and the elastic element is disposed on the side close to the suspension wire;

[0016] The sliding resistor is disposed on the sliding block, and the sliding resistor has different resistance values ​​when the sliding block slides along the groove and is located at different positions in the groove.

[0017] Furthermore, the density measuring component is coaxially arranged with the suspension wire, and the density measuring component also includes a fixing connector, which includes a connecting end and a mounting shaft. The connecting end is screwed to the end of the fixing body, and the mounting shaft is used to connect with the suspension wire.

[0018] A connecting rod is formed at the end of the sliding block away from the elastic element (i.e., the side away from the suspension wire), and the density measuring component is hinged to the connecting rod through the connecting rod.

[0019] Furthermore, the fixed body is a columnar structure, and the viscosity measuring component is a columnar structure. In its natural state, the fixed body and the viscosity measuring component are respectively arranged coaxially with the output shaft of the driving element.

[0020] The oscillation device also includes a balance disc and a connecting clamp. The connecting clamp is mounted on the output shaft of the drive element, and a suspension wire is mounted on the connecting clamp. The suspension wire is connected to the drive element through the connecting clamp and is coaxially arranged with the output shaft of the drive element.

[0021] The balance disc is positioned above the density measuring component, and it passes through the mounting shaft and is coaxially aligned with the output shaft of the drive element.

[0022] Furthermore, it also includes a timing device, which comprises a timer, a light-blocking plate, a laser emitter, and a photosensitive element;

[0023] The light-shielding plate is disposed above the viscosity measuring component, and the light-shielding plate is fixed to the viscosity measuring component and coaxially arranged with the viscosity measuring component.

[0024] The laser emitter and the photosensitive element are respectively disposed within the vacuum chamber and located on opposite sides of the light-shielding plate. The light-shielding plate, the laser emitter, and the photosensitive element are located on the same horizontal plane. The line connecting the laser emitter and the photosensitive element forms an angle Φ with the line connecting the laser emitter and the light-shielding plate.

[0025] When the viscosity measuring component performs periodic torsional vibration, the value of Φ changes with the periodic torsional vibration of the viscosity measuring component, and the shading time of the light-shielding sheet also changes when Φ changes.

[0026] When the viscosity measuring component is stationary, Φ is greater than or equal to 0°. That is, when the viscosity measuring component is stationary, the value of Φ can be greater than 0° or equal to 0°. When Φ is equal to 0°, the laser emitter, the light shield and the photosensitive element in the horizontal plane are on the same straight line.

[0027] The timer is electrically connected to the photosensitive element. When the viscosity measuring component performs periodic torsional vibration, the light-shielding plate, the laser emitter, and the photosensitive element cooperate with the timer to measure the time interval between two instances where the photosensitive element senses light or the time interval when it does not sense light.

[0028] In actual use, the timer consists of two timers (a first timer and a second timer). When the photosensitive element receives a light source signal, the first timer starts timing and stops timing when the light source signal is disconnected. When the light source signal is disconnected, the second timer starts timing and stops timing when a light source signal is received again. At this time, the first timer starts timing again and stops timing when the light source signal is disconnected, and so on.

[0029] Furthermore, it also includes inert atmosphere devices, vacuum devices, sealed furnaces, sealed covers, and sealed boxes;

[0030] The sealing cover is disposed on the sealing box and together with the sealing box forms the first cavity;

[0031] The sealing furnace is located below the sealing box. A second cavity is formed inside the sealing furnace. A crucible is placed in the second cavity. The crucible is used to contain the melt to be tested. The first cavity and the second cavity are connected to form the vacuum chamber.

[0032] The density measuring component is disposed in the first cavity, and the viscosity measuring component is disposed in the second cavity;

[0033] The vacuum device is used to evacuate the first cavity and the second cavity, and the inert atmosphere device is used to introduce an inert atmosphere into the first cavity and the second cavity.

[0034] Furthermore, the crucible is cylindrical.

[0035] Furthermore, the driving element is a stepper motor, and the vacuum device is a vacuum pump.

[0036] Furthermore, it also includes temperature-measuring thermocouple wires, heating devices, and cooling devices.

[0037] The temperature-measuring thermocouple wire is installed inside the viscosity measurement component;

[0038] The heating device includes a high-temperature furnace body, which contains a heating element. The high-temperature furnace body is located outside the sealed furnace. The heating element is used to heat the interior of the sealed furnace. A heat-insulating element is provided between the high-temperature furnace body and the heating element to keep the sealed furnace warm.

[0039] The cooling device includes a first cold pipe and a second cold pipe. The first cold pipe is disposed between the insulation element and the high-temperature furnace body and is used to cool the high-temperature furnace body. The second cold pipe is used to cool the sealed box and prevent the heating device from affecting the density measurement in the first cavity.

[0040] Furthermore, the temperature-sensing thermocouple wire is connected to the heating device via a signal connection, and the heating device adjusts the heating power of the heating element based on the signal fed back by the temperature-sensing thermocouple wire.

[0041] By embedding a thermocouple wire into the inside of a torsion column and immersing it in the melt sample along with the viscosity measurement component, the actual temperature of the melt can be detected, resulting in more accurate measurements.

[0042] Furthermore, it also includes a first lifting device, which is used to drive the oscillation device to move vertically so that the density measuring component is immersed in the melt to be tested.

[0043] Furthermore, the first lifting device is also used to position the light-shielding plate, laser emitter, and photosensitive element of the viscosity measurement component at the same horizontal position.

[0044] Furthermore, it also includes a sealing connector disposed between the sealing box and the sealing furnace;

[0045] It also includes a second lifting device, which is used to control the lifting of the sealing box and to control the cooperation between the sealing box and the sealing connector to achieve the sealing between the sealing box and the sealing furnace.

[0046] In actual use, the oscillation device, viscosity measurement component and sealing box can be set as an integrated structure, in which case only one lifting device is needed.

[0047] Furthermore, flanges are respectively installed at the connection ends of the sealing box and the sealing furnace, and sealing connectors are installed between the flanges.

[0048] This application also provides a method for measuring melt viscosity and density using an integrated measuring instrument, wherein the integrated measuring instrument is the aforementioned integrated measuring instrument for melt viscosity and density, and the measurement method includes the following steps:

[0049] S1: Sample loading: Place the melt to be tested in the vacuum chamber and make the melt to be tested melted, and fill the vacuum chamber with protective gas;

[0050] S2: Density measurement:

[0051] The density measuring component is immersed in the melt to be tested, and the density of the melt to be tested is calculated based on the sliding resistance in the density measuring component.

[0052] According to Archimedes' principle, when the same viscosity measuring component is immersed in a melt, the buoyancy force on the viscosity measuring component will be different if the melt density is different.

[0053] When the viscosity measuring component is not immersed in the melt and is in a natural hanging state, the gravity of the viscosity measuring component is calculated based on the tension of the elastic element;

[0054] When the viscosity measuring component is immersed in the melt, it will float upward under the buoyancy of the melt. The magnitude of the buoyancy force on the viscosity measuring component is calculated based on the upward movement of the sliding block, and the melt density is calculated based on the magnitude of the buoyancy force; or the force balance state is determined based on the floating state (floating or sinking), and the magnitude of the buoyancy force on the viscosity measuring component and the density of the melt are calculated.

[0055] Alternatively, when the viscosity measuring component is immersed in the melt, it floats due to the buoyancy of the melt, and the sliding block moves freely upward in the sliding groove. The greater the melt density, the greater the buoyancy force on the viscosity measuring component, and the greater the upward movement of the sliding block. Since a sliding resistor is provided on the sliding block, the sliding block and the sliding resistor are introduced into a closed circuit, and an electromotive force is applied to the closed circuit. The melt density can be calculated based on the magnitude of the current in the closed circuit.

[0056] S3: Viscosity measurement:

[0057] Fix the crucible, and control the drive element to rotate sequentially in a clockwise direction and then counterclockwise, causing the oscillation device to drive the viscosity measuring component to perform periodic torsional oscillation motion (the amplitude of which will decay due to the viscous force). Use a timing device corresponding to the oscillation device to record the shading time, and calculate the viscosity of the melt to be tested based on the shading time.

[0058] The time of light blocking is recorded using a timing device: the light blocking plate, laser emitter and photosensitive element of the timing device are located on the same horizontal line and the light blocking plate is located between the laser emitter and the photosensitive element. The light blocking plate includes light blocking plate A and light blocking plate B, which are symmetrically arranged along the output axis of the driving element.

[0059] When the light-blocking plates are twisted, light-blocking plates A and B periodically block the light emitted by the laser emitter. Light-blocking plate B rotates counterclockwise, and the time from no blocking to blocking is denoted as t. BA After the light-blocking plate B twists to its maximum amplitude, it folds back, changing from blocking to not blocking. The blocking time is t. BB Then, the light-blocking film A will rotate clockwise to block the light. The time from when it is not blocking the light to when it is blocking the light is recorded as t. AB After the light-blocking film A twists to its maximum amplitude and then returns to its original position, it changes from blocking to not blocking. The blocking time is t. AA ;

[0060] When the driving element rotates sequentially in a clockwise direction and then in a counterclockwise direction, it can make t BA +t BB =t AB +t AA .

[0061] The equation of motion for the periodic torsional oscillation of the viscosity measuring component driven by the oscillating device is:

[0062]

[0063] in:

[0064] Indicates the viscosity measurement component in Amplitude at time, From The time from the start to the i-th time;

[0065] Indicates the viscosity measurement component in Amplitude at time;

[0066] Indicates the attenuation coefficient;

[0067] Indicates time;

[0068] It represents angular velocity.

[0069] From the above equations of motion, we can obtain The value;

[0070] The viscosity calculation formula is:

[0071]

[0072] in: , These represent the radius of the viscosity measuring component and the inner diameter of the crucible, respectively.

[0073] Indicates the height of the viscosity measurement component;

[0074] The coefficient can be obtained through calibration with a standard sample of known viscosity or through blank testing;

[0075] This represents resistance force, and the formula for calculating resistance force is:

[0076]

[0077] in: Indicates the oscillation cycle. ;

[0078] This represents the moment of inertia of the viscosity measuring component. The moment of inertia of the density measuring component, for a solid cylinder, is calculated using the following formula:

[0079]

[0080] in: Indicates quality, Indicates the radius.

[0081] Existing measurement methods, such as the capillary method, cannot measure high-melting-point melts and require very high sample purity; otherwise, the capillary can easily become clogged, leading to erroneous measurement results. The rotation method places extremely high demands on the motor and machinery, and its accuracy is limited by existing torque sensors when measuring low-viscosity melts.

[0082] The melt oscillating viscosity meter proposed in this invention can simultaneously measure the kinematic viscosity and density of the melt. Combined with a calculation device, it can automatically calculate the dynamic viscosity of the melt. Furthermore, by embedding a thermocouple wire inside the torsion column, the actual temperature of the melt is monitored in real time, resulting in more accurate measurements and facilitating automated precision measurement.

[0083] Further, the sample loading steps include:

[0084] The molten material to be tested is loaded into the crucible, and the crucible is sent to a fixed position in the sealed furnace. The first lifting device and the second lifting device are controlled to make the sealing box and the sealing furnace seal and fasten, and the sealing cover and the sealing box seal and lock.

[0085] The first chamber, the second chamber, and the inside of the sealing cover (i.e., the vacuum chamber) are evacuated using a vacuum device, and an inert atmosphere device is turned on to deliver an inert protective atmosphere into the vacuum chamber.

[0086] Turn on the heating and cooling devices (circulating cooling water), and set the heating / constant temperature / cooling program of the high-temperature furnace body. The heating device changes or maintains the melt to be tested in the crucible into a molten state, and the cooling device is used to prevent the heating device from affecting the density measurement in the first chamber.

[0087] The beneficial effects of this utility model are:

[0088] (1) This application integrates a density measuring device and a viscosity measuring element by setting up an oscillation device, and places them simultaneously in a vacuum chamber. The density measuring device and the viscosity measuring element perform periodic torsional vibration motion under the action of the driving element, so that the density of the melt can be calculated based on the motion data of the density measuring device, and the viscosity of the melt can be calculated based on the motion data of the viscosity measuring element. That is, the integrated melt viscosity and density measuring instrument provided by this application can simultaneously measure the viscosity and density of the melt with one device, reducing the cost and time of melt viscosity measurement.

[0089] (2) This application adopts a lifting mechanism to design the oscillation device to be lifted, so that the viscosity measuring component can be immersed in the melt sample. This design, in which the crucible is stationary and the inner stator drives the interstitial fluid to move, is based on the basic principle of viscosity measurement, and the traceability of the measured value is clearer.

[0090] (3) By embedding the thermocouple wire into the inside of the torsion column and immersing it in the melt sample together with the viscosity measuring element, the actual temperature of the melt can be detected, making the measurement more accurate. Attached Figure Description

[0091] Figure 1 This is a schematic diagram of the integrated measuring instrument for melt viscosity and density according to an embodiment of this utility model;

[0092] Figure 2 This is a schematic diagram of the connection structure of the density measuring component and the viscosity measuring component according to an embodiment of the present invention;

[0093] Figure 3 This is a schematic diagram of the density measurement component according to an embodiment of the present invention (with some parts hidden).

[0094] Figure 4 This is a schematic diagram (top view) of the timing device according to an embodiment of the present invention.

[0095] Figure 5 This is a schematic diagram of the integrated measuring instrument for melt viscosity and density according to an embodiment of this utility model.

[0096] The labels for the attached figures are as follows:

[0097] 10. Oscillating device; 110. Suspension wire; 120. Connecting rod; 130. Driving element; 140. Balance disc; 150. Connecting clamp; 20. Density measuring assembly; 210. Fixing body; 211. Slide groove; 220. Sliding block; 221. Connecting rod; 230. Elastic element; 240. Sliding resistor; 250. Fixed connector; 30. Viscosity measuring assembly; 310. Thermocouple wire; 40. Timing device; 410. Photosensitive element; 420. Excitation device; Light emitter; 430, light shield; 431, light shield A; 432, light shield B; 50, vacuum device; 510, inert atmosphere device; 60, sealed furnace; 610, second chamber; 70, sealed box; 710, first chamber; 720, sealed cover; 80, heating device; 810, heating element; 820, heat preservation element; 830, crucible; 840, high-temperature furnace body; 90, first lifting device; 100, second lifting device; 200, cooling device. Detailed Implementation

[0098] The present invention will now be described in detail with reference to the accompanying drawings.

[0099] like Figures 1-5 As shown, this application provides an integrated measuring instrument for melt viscosity and density, including a vacuum chamber, an oscillation device 10, a density measuring component 20, and a viscosity measuring component 30;

[0100] Density measuring component 20 and viscosity measuring component 30 are respectively disposed in the vacuum chamber;

[0101] The oscillation device 10 includes a suspension wire 110, a connecting rod 120, and a driving element 130. One end of the suspension wire 110 is connected to the driving element 130, and the other end is connected to the density measurement assembly 20.

[0102] One end of the connecting rod 120 is hinged to the density measuring component 20, and the other end is fixed to the viscosity measuring component 30. The viscosity measuring component 30 is used to immerse itself in the melt.

[0103] When the driving element 130 drives the suspension wire 110 to rotate, the density measuring component 20 and the viscosity measuring component 30 perform periodic torsional vibration motion under the drive of the suspension wire 110 and the connecting rod 120, respectively.

[0104] This application integrates a density measuring component 20 and a viscosity measuring component 30 into a single unit via an oscillation device 10, placing them simultaneously within a vacuum chamber. Under the action of a driving element 130, the density measuring component 20 and the viscosity measuring component 30 undergo periodic torsional vibration. This allows the melt density to be calculated based on the motion data of the density measuring component 20, and the melt viscosity to be calculated based on the motion data of the melt viscosity measuring component 30. In other words, the integrated melt viscosity and density measuring instrument provided in this application allows for the simultaneous measurement of both melt viscosity and density using a single device, reducing the cost and time required for melt viscosity measurement.

[0105] In this embodiment, the density measuring component 20 includes a fixed body 210, a sliding block 220, an elastic element 230, and a sliding resistor 240;

[0106] The fixing body 210 is used to fix the suspension wire 110, and the fixing body 210 has a sliding groove 211 inside;

[0107] The sliding block 220 is slidably disposed on the slide groove 211;

[0108] One end of the elastic element 230 is fixed to the fixed body 210, and the other end is fixed to the sliding block 220. The elastic element 230 is located on the side close to the suspension wire 110.

[0109] The sliding resistor 240 is disposed on the sliding block 220. When the sliding block 220 slides along the slide groove 211 and is located at different positions of the slide groove 211, the sliding resistor 240 has different resistance values.

[0110] In this embodiment, the density measuring component 20 is coaxially arranged with the suspension wire 110. The density measuring component 20 also includes a fixing connector 250, which includes a connecting end and a mounting shaft. The connecting end is screwed to the end of the fixing body 210, and the mounting shaft is used to connect with the suspension wire 110.

[0111] A connecting rod 221 is formed at the end of the sliding block 220 away from the elastic element 230 (i.e., the side away from the suspension wire 110), and the density measuring component 20 is hinged to the connecting rod 120 through the connecting rod 221.

[0112] In this embodiment, the fixing body 210 is a columnar structure, and the viscosity measuring component 30 is a columnar structure. In its natural state, the fixing body 210 and the viscosity measuring component 30 are respectively arranged coaxially with the output shaft of the driving element 130.

[0113] The oscillation device 10 also includes a balance disc 140 and a connecting chuck 150. The connecting chuck 150 is mounted on the output shaft of the drive element 130, and the suspension wire 110 is mounted on the connecting chuck 150. The suspension wire 110 is connected to the drive element 130 through the connecting chuck 150 and is coaxially arranged with the output shaft of the drive element 130.

[0114] The balance disc 140 is positioned above the density measuring component 20, and the balance disc 140 passes through the mounting shaft and is coaxially aligned with the output shaft of the drive element 130.

[0115] In this embodiment, a timing device 40 is also included, which includes a timer (not shown in the figure), a light-blocking plate 430, a laser emitter 420, and a photosensitive element 410;

[0116] The light-shielding plate 430 is disposed above the viscosity measuring component 30, and the light-shielding plate 430 is fixed to the viscosity measuring component 30 and coaxially disposed with the viscosity measuring component 30;

[0117] The laser emitter 420 and the photosensitive element 410 are respectively disposed in the vacuum chamber and located on both sides of the light shield 430. The light shield 430, the laser emitter 420 and the photosensitive element 410 are located in the same horizontal plane, and there is an angle Φ between the line connecting the laser emitter 420 and the photosensitive element 410 and the line connecting the laser emitter 420 and the light shield 430.

[0118] When the viscosity measuring component 30 performs periodic torsional vibration, the value of Φ changes with the periodic torsional vibration of the viscosity measuring component, and the shading time of the light-shielding sheet also changes when Φ changes.

[0119] When the viscosity measuring component 30 is stationary, Φ is greater than or equal to 0°. That is, when the viscosity measuring component is stationary, the value of Φ can be greater than 0° or equal to 0°. When Φ is equal to 0°, the laser emitter, the light shield and the photosensitive element in the horizontal plane are on the same straight line.

[0120] The timer is electrically connected to the photosensitive element 410. When the viscosity measuring component 30 performs periodic torsional vibration, the light-blocking plate 430, the laser emitter 420, and the photosensitive element 410 cooperate with the timer to measure the time interval between two instances where the photosensitive element 410 senses light or the time interval when it does not sense light.

[0121] In actual use, the timer includes two timers (a first timer and a second timer). When the photosensitive element 410 receives a light source signal, the first timer starts timing and stops timing when the light source signal is disconnected. When the light source signal is disconnected, the second timer starts timing and stops timing when the light source signal is received again. At this time, the first timer starts timing again and stops timing when the light source signal is disconnected, and so on.

[0122] In this embodiment, it also includes an inert atmosphere device 510 (not shown in the figure), a vacuum device 50, a sealing furnace 60, a sealing cover 720, and a sealing box 70;

[0123] The sealing cover 720 is disposed on the sealing box 70 and together with the sealing box 70 forms the first cavity 710;

[0124] A sealed furnace 60 is located below a sealed box 70. A second cavity 610 is formed inside the sealed furnace 60. A crucible 830 is placed inside the second cavity 610. The crucible 830 is used to hold the melt to be tested. The first cavity 710 and the second cavity 610 are connected to form a vacuum chamber.

[0125] The density measuring component 20 is disposed in the first cavity 710, and the viscosity measuring component 30 is disposed in the second cavity 610;

[0126] Vacuum device 50 is used to evacuate the first cavity 710 and the second cavity 610, and inert atmosphere device 510 is used to introduce inert atmosphere into the first cavity 710 and the second cavity 610.

[0127] In this embodiment, the crucible 830 is a cylindrical body.

[0128] In this embodiment, the driving element 130 is a stepper motor, and the vacuum device 50 is a vacuum pump.

[0129] In this embodiment, the device also includes a temperature-measuring thermocouple wire 310, a heating device 80, and a cooling device 200.

[0130] The temperature-measuring thermocouple wire 310 is installed inside the viscosity measuring component 30;

[0131] The heating device 80 includes a high-temperature furnace body 840, a heating element 810 inside the high-temperature furnace body 840, the high-temperature furnace body 840 is disposed outside the sealed furnace 60, the heating element 810 is used to heat the inside of the sealed furnace 60, and a heat insulation element 820 is disposed between the high-temperature furnace body 840 and the heating element 810, the heat insulation element 820 is used to keep the sealed furnace 60 warm.

[0132] The cooling device 200 is a water-cooled box. The cooling device 200 includes a first cold pipe and a second cold pipe. The first cold pipe is located between the insulation element 820 and the high-temperature furnace body 840 and is used to cool the high-temperature furnace body 840. The second cold pipe is used to cool the sealing box 70. The second cold pipe is located at the connecting flange between the sealing furnace 60 and the sealing box 70 to prevent the heating device 80 from affecting the density measurement in the first cavity 710.

[0133] In this embodiment, the temperature-sensing thermocouple wire 310 is signal-connected to the heating device 80, and the heating device 80 adjusts the heating power of the heating element 810 based on the signal fed back by the temperature-sensing thermocouple wire 310.

[0134] By embedding the temperature-sensing thermocouple wire 310 inside the torsion column and immersing it together with the viscosity measurement component 30 into the melt sample, the actual temperature of the melt can be detected, resulting in more accurate measurements.

[0135] In this embodiment, a first lifting device 90 is also included. The first lifting device 90 is used to drive the oscillation device 10 to move in the vertical direction so that the density measuring component 20 is immersed in the melt to be tested.

[0136] In this embodiment, the first lifting device 90 is also used to position the light shield 430, laser emitter 420 and photosensitive element 410 of the viscosity measuring component 30 at the same horizontal position.

[0137] In this embodiment, a sealing connector is also included, which is disposed between the sealing box 70 and the sealing furnace 60;

[0138] It also includes a second lifting device 100, which is used to control the lifting of the sealing box 70 and to control the sealing box 70 to cooperate with the sealing connector to achieve the sealing of the sealing box 70 and the sealing furnace 60.

[0139] In actual use, the oscillation device 10, viscosity measurement component 30 and sealing box 70 can be set as an integrated structure, in which case only one lifting device is needed.

[0140] This application also provides a method for measuring melt viscosity and density using an integrated measuring instrument, wherein the integrated measuring instrument is the aforementioned integrated measuring instrument for melt viscosity and density, and the measurement method includes the following steps:

[0141] S1: Sample loading: Place the melt to be tested in the vacuum chamber and make the melt to be tested melted, and fill the vacuum chamber with protective gas;

[0142] S2: Density measurement:

[0143] The density measuring component 20 is immersed in the melt to be tested, and the density of the melt to be tested is calculated based on the sliding resistance 240 in the density measuring component 20.

[0144] According to Archimedes' principle, when the same viscosity measuring component 30 is immersed in a melt, the buoyancy force on the viscosity measuring component 30 will be different if the melt density is different.

[0145] When the viscosity measuring component 30 is not immersed in the melt and is in a natural hanging state, the gravity of the viscosity measuring component 30 is calculated based on the tension of the elastic element 230.

[0146] When the viscosity measuring component 30 is immersed in the melt, it will float upward under the buoyancy of the melt. The magnitude of the buoyancy force on the viscosity measuring component 30 is calculated based on the upward movement of the sliding block 220, and the melt density is calculated based on the magnitude of the buoyancy force. Alternatively, the force balance state can be determined based on the floating state (floating or sinking), and the magnitude of the buoyancy force on the viscosity measuring component 30 and the density of the melt can be calculated.

[0147] Alternatively, when the viscosity measuring component 30 is immersed in the melt, it floats under the buoyancy of the melt, and the sliding block 220 moves freely upward in the sliding groove. The greater the melt density, the greater the buoyancy force on the viscosity measuring component 30, and the greater the upward movement of the sliding block 220. Since the sliding block 220 is equipped with a sliding resistor 240, the sliding block 220 and the sliding resistor 240 are introduced into a closed circuit, and an electromotive force is applied to the closed circuit. The melt density can be calculated based on the magnitude of the current in the closed circuit.

[0148] S3: Viscosity measurement:

[0149] Fix the crucible 830, and control the drive element 130 to rotate sequentially in a clockwise direction and then counterclockwise direction, so that the oscillation device 10 drives the viscosity measuring component 30 to perform periodic torsional oscillation motion (the amplitude of which will be attenuated due to the viscous force). Use the timing device 40, which is set corresponding to the oscillation device 10, to count the light blocking time, and calculate the viscosity of the melt to be tested based on the light blocking time.

[0150] The timing device 40 is used to count the time of light blocking: the light blocking plate 430, the laser emitter 420 and the photosensitive element 410 of the timing device 40 are located on the same horizontal line and the light blocking plate 430 is located between the laser emitter 420 and the photosensitive element 410. The light blocking plate 430 includes a light blocking plate A 431 and a light blocking plate B 432. The light blocking plate A 431 and the light blocking plate B 432 are symmetrically arranged along the output axis of the driving element 130.

[0151] When the light-shielding plate 430 is twisted, light-shielding plate A 431 and light-shielding plate B 432 periodically block the light emitted by the laser emitter 420. Light-shielding plate B 432 rotates counterclockwise. The time from no blocking to blocking is denoted as t. BA After the light-blocking plate B432 twists to its maximum amplitude, it folds back, changing from blocking to not blocking. The blocking time is t. BB Then, the light-blocking film A431 will rotate clockwise to block the light. The time from when it is not blocked to when it is blocked is denoted as t. AB After the light-blocking film A431 twists to its maximum amplitude, it folds back, changing from blocking to not blocking. The blocking time is t. AA ;

[0152] When the driving element rotates sequentially in a clockwise direction and then in a counterclockwise direction, it can make t BA +t BB =t AB +t AA .

[0153] The equation of motion for the periodic torsional oscillation of the viscosity measuring component driven by the oscillating device is:

[0154]

[0155] in:

[0156] Indicates the viscosity measurement component in Amplitude at time, From The time from the start to the i-th time;

[0157] Indicates the viscosity measurement component in Amplitude at time;

[0158] Indicates the attenuation coefficient;

[0159] Indicates time;

[0160] It represents angular velocity.

[0161] From the above equations of motion, we can obtain The value;

[0162] The viscosity calculation formula is:

[0163]

[0164] in: , These represent the radius of the viscosity measuring component and the inner diameter of the crucible, respectively.

[0165] Indicates the height of the viscosity measurement component;

[0166] The coefficient can be obtained through calibration with a standard sample of known viscosity or through blank testing;

[0167] This represents resistance force, and the formula for calculating resistance force is:

[0168]

[0169] in: Indicates the oscillation cycle. ;

[0170] This represents the moment of inertia of the viscosity measuring component. The moment of inertia of the density measuring component, for a solid cylinder, is calculated using the following formula:

[0171]

[0172] in: Indicates quality, Indicates the radius.

[0173] Existing measurement methods, such as the capillary method, cannot measure high-melting-point melts and require very high sample purity; otherwise, the capillary can easily become clogged, leading to erroneous measurement results. The rotation method places extremely high demands on the motor and machinery, and its accuracy is limited by existing torque sensors when measuring low-viscosity melts.

[0174] The melt oscillating viscosity meter proposed in this invention can simultaneously measure the kinematic viscosity and density of the melt. Combined with a calculation device, it can automatically calculate the dynamic viscosity of the melt. At the same time, the thermocouple wire 310 is embedded inside the torsion column to detect the actual temperature of the melt in real time, making the measurement more accurate and facilitating the realization of automated precision measurement.

[0175] In this embodiment, the sample loading step includes:

[0176] The melt to be tested is loaded into the crucible 830, and the crucible 830 is sent into a fixed position inside the sealing furnace 60. The first lifting device 90 and the second lifting device 100 are controlled to make the sealing box 70 and the sealing furnace 60 seal and fasten, and the sealing cover 720 and the sealing box 70 seal and fasten, and then the seal is locked.

[0177] The vacuum device 50 is used to evacuate the first chamber 710, the second chamber 610 and the sealing cover 720 (i.e., the vacuum chamber), and the inert atmosphere device 510 is turned on to deliver an inert protective atmosphere into the vacuum chamber.

[0178] Turn on the heating device 80 and the cooling device 200 (circulating cooling water), and set the heating / constant temperature / cooling program of the high temperature furnace body 840. The heating device 80 makes the melt to be tested in the crucible 830 become or maintain the melt state. The cooling device 200 is used to prevent the heating device 80 from affecting the density measurement in the first chamber 710.

[0179] The above description is only a preferred embodiment of the present utility model and does not limit the scope of patent protection of the present utility model. Any equivalent structural transformations made based on the content of the present utility model specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present utility model.

Claims

1. An integrated measuring instrument of melt viscosity and density, characterized in that, The density measuring assembly and the viscosity measuring assembly are arranged in the vacuum chamber respectively; The density measuring assembly and the viscosity measuring assembly are arranged in the vacuum chamber respectively; The oscillation device comprises a suspension wire, a connecting rod and a driving element, one end of the suspension wire is connected with the driving element, and the other end is connected with the density measuring assembly; One end of the connecting rod is hingedly connected with the density measuring assembly, and the other end is fixedly connected with the viscosity measuring assembly, and the viscosity measuring assembly is used for being immersed in the melt; When the driving element drives the suspension wire to rotate, the density measuring assembly and the viscosity measuring assembly are driven by the suspension wire and the connecting rod to make periodic torsional vibration motion respectively.

2. An integrated melt viscosity and density measuring instrument as in claim 1, wherein, The density measuring assembly comprises a fixed body, a sliding block, an elastic element and a sliding resistor; The fixed body is used for being fixed with the suspension wire, and the fixed body has a sliding groove therein; The sliding block is slidably arranged on the sliding groove; One end of the elastic element is fixed with the fixed body, and the other end is fixed with the sliding block, and the elastic element is arranged on the side close to the suspension wire; The sliding resistor is arranged on the sliding block, and the sliding resistor has different resistance values when the sliding block is located at different positions of the sliding groove.

3. An integrated melt viscosity and density measuring instrument as in claim 2, wherein, The density measuring assembly is coaxially arranged with the suspension wire, and the density measuring assembly further comprises a fixed connecting piece, the fixed connecting piece comprises a connecting end and a mounting shaft, the connecting end is screw-connected and fixed to the end of the fixed body, and the mounting shaft is used for being connected with the suspension wire; The sliding block is formed with a connecting rod at the end away from the elastic element, and the density measuring assembly is hingedly connected with the connecting rod.

4. An integrated melt viscosity and density measuring instrument as in claim 3, wherein, The fixed body is a columnar body structure, the viscosity measuring assembly is a columnar body structure, and in a natural state, the fixed body and the viscosity measuring assembly are coaxially arranged with the output shaft of the driving element respectively; The oscillation device further comprises a balance disc and a connecting chuck, the connecting chuck is mounted on the output shaft of the driving element, the suspension wire is mounted on the connecting chuck, and the suspension wire is connected with the driving element through the connecting chuck and is coaxially arranged with the output shaft of the driving element; The balance disc is arranged above the density measuring assembly, the balance disc is arranged on the mounting shaft and is coaxially arranged with the output shaft of the driving element.

5. An integrated melt viscosity and density measuring instrument as in claim 1, wherein, Further comprising a timing device, the timing device comprises a timer, a light shield, a laser emitter and a photosensitive element; The light shield is arranged above the viscosity measuring assembly, the light shield is fixed with the viscosity measuring assembly and is coaxially arranged with the viscosity measuring assembly, the light shield comprises a light shield A and a light shield B, and the light shield A and the light shield B are symmetrically arranged along the output shaft of the driving element; The laser emitter and the photosensitive element are arranged in the vacuum chamber respectively and are located on the two sides of the light shield respectively, the light shield, the laser emitter and the photosensitive element are located in the same horizontal plane, and the line connecting the laser emitter and the photosensitive element and the line connecting the laser emitter and the light shield have an included angle Φ; When the viscosity measuring assembly makes periodic torsional vibration motion, the value of Φ changes with the periodic torsional vibration motion of the viscosity measuring assembly; when the viscosity measuring assembly is static, Φ is greater than or equal to 0°. The timer is electrically connected with the light sensing element, and is used for measuring the time interval of twice sensing light or the time interval of twice not sensing light when the viscosity measuring assembly is subjected to periodic torsional vibration.

6. An integrated melt viscosity and density measuring instrument as in claim 1, wherein, The inert atmosphere device, the vacuum device, the sealed furnace, the sealed cover and the sealed box are further included. The sealed cover is arranged on the sealed box and forms a first cavity together with the sealed box. The sealed furnace is arranged below the sealed box, and a second cavity is formed in the sealed furnace. The second cavity is arranged with a crucible for accommodating the melt to be measured. The density measuring assembly is arranged in the first cavity, and the viscosity measuring assembly is arranged in the second cavity.

7. An integrated melt viscosity and density measuring instrument as in claim 6, wherein, The vacuum device is used for vacuumizing the first cavity and the second cavity, and the inert atmosphere device is used for inputting inert atmosphere into the first cavity and the second cavity. The temperature measuring thermocouple wire, the heating device and the cooling device are further included. The temperature measuring thermocouple wire is arranged in the viscosity measuring assembly. The heating device includes a high-temperature furnace body with a heating element.

8. An integrated melt viscosity and density measuring instrument as in claim 6, wherein, The high-temperature furnace body is arranged outside the sealed furnace.

9. An integrated melt viscosity and density measuring instrument as in claim 8, wherein, The heating element is used for heating the sealed furnace.

10. An integrated melt viscosity and density measuring instrument as in claim 9, wherein, The high-temperature furnace body and the heating element are arranged with a heat preservation element for heat preservation of the sealed furnace. The cooling device includes a first cooling pipe and a second cooling pipe. The first cooling pipe is arranged between the heat preservation element and the high-temperature furnace body and is used for cooling the high-temperature furnace body. The second cooling pipe is used for cooling the sealed box to prevent the heating device from affecting the measurement of the density in the first cavity. The first lifting device is further included. The first lifting device is used for driving the oscillation device to move along the vertical direction to immerse the density measuring assembly into the melt to be measured. The sealed connecting piece is arranged between the sealed box and the sealed furnace. The second lifting device is further included. The second lifting device is used for controlling the lifting of the sealed box and controlling the cooperation of the sealed box and the sealed connecting piece to realize the sealing of the sealed box and the sealed furnace.

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