• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a rotary rheometer for measuring powdery or granular materials, comprising a measuring container (1) for receiving the material to be measured (20), a cover (13) for the measuring container (1), a measuring body held on a measuring shaft (2) (3), wherein the measuring body (3) and the container (1) are rotatable relative to each other, wherein the measuring shaft (2) friction, in particular contactless, through the cover (13) is guided and an outside of the measuring container (1) arranged evaluation (40) for evaluating the measured values taken from the measuring shaft (2). According to the invention, for sealing the bearing gap 21 or the passage (7) of the measuring shaft (2) in or through the cover (13) into the measuring container (1), both a fluid seal with a sealing fluid supply line and at least one cooperating with this fluid seal geometric seal are provided as a powder barrier.
    公开号:AT516405A4
    申请号:T50196/2015
    申请日:2015-03-11
    公开日:2016-05-15
    发明作者:Richard Romirer；Denis Schütz；Matthias Narnhofer；Andreas Flecker
    申请人:Anton Paar Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a rotary rheometer for measuring powdery or granular materials, comprising a measuring container for receiving the material to be measured and a cover for the measuring container and a driven by a measuring shaft measuring body which is rotatable in the container relative thereto, wherein the measuring shaft friction, in particular contactless through which the cover is guided and with a measuring system arranged outside the measuring container for evaluating the measured values taken from the measuring shaft.
    The invention has for its object to create a simple design Drehrheometer for measuring powders and / or bulk and / or granular material and to protect both the user and sensitive equipment parts from out or occurring dust.
    Rheometers for the rheological characterization of powders are known. In this case, a measuring body in a container with the bulk material to be examined or powder or Paritkelmaterial is rotating or rotating oscillating moves, sometimes in combination with a linear movement of the measuring body, in particular up or down in the sample. The torque counteracting the sample of movement and / or the normal force applied thereto are measured. Various types of rheometers or viscometers are used, which are either equipped as universal rheometer with special powder cells or directly produced for the application devices are used, often with additional evaluation options such as, for example, packing density and / or weight of the test substance, etc.
    The powders can be measured both in a fluidized or dynamic state and in the non-fluidized or static state. Arrangements in which the powder is pre-pressed under pressure or also pressurized during the measurement are known. Sample preparation by fluidization enables the " erase of powder memory " e.g. of filling effects, caking, etc., followed by static powder characterization. In the dynamic case, the powder should be able to be kept in a fluidized state during the measurement.
    JPH 08271400 A shows a system which measures the penetration depth of a conical rotor and the torque occurring to characterize the powder and at the same time fluidizes the powder in the measuring cup with means for vibrating the measuring cup.
    JP 2007040770 shows a system with the possibility of rotating a measuring body through a powder in a measuring cup. An arrangement with compressed air, which flows through the powder, thereby enabling the fluidization of the powder.
    However, fluidization can also be caused by vibration, for example by means of piezo elements, ultrasound or unbalance motor. At the same time, this vibration can be used to set a specific powder level in the measuring cup. Through the fluidization and thereby carried out "erasing the powder memory" a user-independent measurement is ensured.
    All devices have in common that the measuring body is moved relative to the powder. This movement can be performed rotating or rotating oscillating. In this case, either the measuring cup can be rotated and the measuring body can be equipped with means for torque determination or the measuring body is rotated and the torques occurring are determined, for example, with a measuring motor acting on the measuring shaft.
    Optionally, the movement is still combined with a linear feed along the axis of rotation, which then leads to a screw-shaped movement of the measuring body in the powder.
    The measuring motor of a rheometer can then be used to record the normal forces and / or torques occurring on the measuring body. The evaluation is analogous to the rheometer based on these measurements, but also phenomenological evaluations can be performed, e.g. the indication of the so-called flow energy (unit: Joule) as the integral of the torque over the angle of rotation and / or the normal force over the travel measured during the process of the measuring body in the powder.
    In order to be able to carry out highly accurate measurements with a rheometer, the rotation of the measuring body must take place as smoothly as possible. Therefore, high demands are made on the bearing of the measuring shaft, which carries the measuring body, usually as frictionless ball bearings, magnetic bearings, fluid bearings and the like. Used. The occurring normal forces can be measured in different ways. The measuring cell can be designed, for example, as a "weighing cell" on the measuring cup, or also on the measuring motor or on the measuring-body axis
    Measuring units be arranged. Rheometers may, for example, also have special air bearings with integrated normal force measurement (AT 404192).
    The measuring shaft is thus stored as frictionless as possible, in particular without contact, guided by the driving motor to the measuring body.
    Also known are special Rheometerausführungen to protect measuring shafts, bearings and drive motor against aggressive gases and / or moisture. This can be done on the one hand by friction-free seals possible. Stuffing boxes are used, for example, to prevent the ingress of aggressive gases into the measuring motor; Labyrinth seals are also known.
    In order to carry out powder measurements universally and in particular also for fluidized powders with such a rheometer, the use of a single such seal is not sufficient. The sensitive, mostly electronic measuring system must be protected against dust intrusion, especially by special precautions. Furthermore, the escape of harmful powders from the measuring cell or the measuring range should be avoided.
    If the powder is in a fluidized state, an aerosol, which consists of the fine fraction of the powder, forms above the powder bed. In addition, larger, heavier powder particles are thrown in the direction of the seal or through the implementation of the measuring shaft during the fluidization with high kinetic energy.
    An object of the invention is to provide an accurate measured value powder rheometer with adequate dust protection. Without sufficient dust protection, the application is usually limited to very specific powder. Powders that are difficult to fluidize and form large, bursting powder bubbles when passing gases are usually excluded from the investigation. Due to these bursting bubbles, the powder particles receive very high kinetic energies and become in all directions and also out of the cup interior or measuring container out against the measuring axis or shaft and / or bearing of the measuring motor or the components for the torque measurement and / or the means thrown for normal force measurement.
    If the powder particles are very fine, a labyrinth seal will not adequately seal. If the powder components have too high energies, a labyrinth seal can be filled by penetrating particles and fail.
    Ball bearings, which are more robust against the introduction of powder dusts, can be damaged when measuring fine, dust-forming powders. In addition, with these arrangements, the torques occurring can not be determined with sufficient accuracy.
    The invention is also based on the essential task of providing dust protection for a rheometer, so that universal powders of very different composition, size distribution and fluidizability can be measured.
    In addition, for reasons of operator safety, the powders should not be released into the device environment. In this way, powders with aggressive components, which pose a health risk for the operator, can be examined.
    A further object of the invention is therefore to provide a powder measuring system or rheometer which prevents swirling and release of powder fractions into the ambient air.
    According to the invention, a rheometer of the aforementioned type is characterized in that both a fluid seal with a sealing fluid supply line and at least one geometric seal cooperating with this fluid seal are provided as a powder barrier for sealing the bearing gap or the passage of the measuring shaft through the cover into the measuring container. According to the invention, a combination of at least two sealing principles or sealing variants is thus used in order to prevent leakage of powder from the measuring container or penetration of powder constituents into the rheometer, in particular into the evaluation electronics.
    This prevents powder deposits from forming in the area of bushings and bearings of the measuring shaft and thus additional frictional forces. This increases the repeatability of the measurement and ensures, when using, for example, air bearings in the rheometer, the highest accuracy in terms of the occurring torques.
    It is inventively provided to provide a dust cover for a rheometer in the form of a combination of a fluid seal and a geometric barrier in non-contact implementation of the measuring wave through the cover of the measuring container. The sealing fluid used is preferably the same gas used to fluidize the powder. The geometric barrier retains the fine powder particles in the aerosol with fine channels or with fine geometric structures or intermeshing teeth in the manner of a labyrinth seal for the sealing fluid. The problem that the use of only one type of seal is not sufficient to avoid the complications occurring in powder measurements has been solved according to the invention. For the expert, this solution came unexpectedly, since the use of the seals could expect a deterioration in the quality of the measured values.
    An easy to be designed geometric powder barrier can be provided by the measuring shaft and the cover together as a geometric powder barrier a sealing fine structure, preferably a labyrinth seal form.
    A fluid seal can be created without disturbing the measurement or impairment of the measurement results by the fluid seal comprises a pressurized air supply line or the fluid seal comprises a device connected to the measuring container for generating a negative pressure so that in the bearing gap between the measuring shaft and the cover, in particular in the area below a fine geometric powder barrier, a directed into the measuring vessel gas stream of sealing gas or outside air is formed.
    An alternative fluid seal provides that a supply line for supplying a sealing gas which exceeds the gas pressure in the measuring vessel opens as the fluid seal into the region of passage between the geometric powder barrier and the interior of the measuring container, in particular into the cover or the passage of the measuring shaft.
    One possibility of a fluid seal provides that at least one or more outflow opening (s) of a sealing fluid supply line lies on the underside of the cover in the vicinity of the passage of the measuring shaft and / or above the screen, wherein optionally the sealing fluid is flowed through the outlet opening under pressure or is sucked into this by training a negative pressure in the measuring container.
    A, in particular in combination with a labyrinth seal, advantageous geometric seal is created when a screen is worn as a geometric powder barrier of the measuring shaft within the measuring container whose surface extension extends perpendicular to the measuring shaft, the opening of the implementation on all sides.
    In the following, the invention is explained in more detail for example with reference to the drawings.
    Fig. 1 shows a schematic section through a rheometer according to the invention with a measuring container with an attached lid. FIG. 2 shows a rheometer in which the measuring container is surrounded by a casing or an envelope casing. FIGS. 3 a, 3 b and 3 c show differently shaped feedthroughs of the measuring shaft through a cover of the measuring container or the enveloping housing. Fig. 4 shows an embodiment of a fluid seal.
    Fig. 1 shows schematically an embodiment of a powder rheometer with a cylindrical measuring container 1, which at the same time also serves to fluidize the powder 20 to be examined with e.g. via a line 17 according to arrow 16 is supplied compressed air. The compressed air or another working gas is pumped via line 17 and a diffuser 15 according to arrows 18 in the measuring container 1. It can be used different materials for the frits of the diffuser 15, which provide a customized to the respective powder 20 to be measured turbulence.
    On the measuring cell or the measuring container 1, a cover 13 is set, which is e.g. can be screwed or clamped. In addition to a combination of screws and a sealing ring 14 and screw, snaps or flange are conceivable. The measuring container 1 can also be made in several parts in order to easily remove it from the rheometer or the fluid system, fill, weigh and / or clean.
    Through a passage 7 in the cover 13 of the measuring container 1, a measuring shaft 2 is performed, which carries a measuring body 3 in its lower, projecting into the measuring container 1 end portion. This measuring body 3 protrudes into the powder 20 and is connected via a coupling 6 to a drive or measuring motor 4, which is supported by a carrier 5 above the measuring container 1. The drive or measuring motor 4 rotates the measuring shaft 2 in the powder 20.
    Arrangements relating to the measurement of occurring normal forces and / or torques or drives for the rotation of the drive or measuring motor 4 and any lifting and lowering of the measuring body 3 are not shown. An evaluation unit 40 for the measured values taken is shown schematically in FIG. All these units are known to those skilled in the art as well as the basic construction of rheometers.
    The cover 13 is made in one piece in the present case and has in the middle a bore or passage 7 for receiving and carrying the measuring axis or shaft 2, which carries the measuring body 3. The measuring shaft 2 carries in the present case components of the geometric seal. The cover 13 is indicated by e.g. Turning or milling created component of the geometric seal on or carries parts of the geometric seal. In the present case, a labyrinth seal is shown between the measuring shaft 2 and the cover 13, which has a gap 9, which can be utilized for an air duct. If necessary, these labyrinth seal can also be geschniten in the cover 13 by forming individual grooves. Advantageously, both the cover 13 and the measuring shaft 2 carry parts of the labyrinth profile. In particular, it is advantageous if the cover 13 is multi-part. For a one-piece embodiment of the cover 13, it is also important that the measuring shaft 2 can be performed by the cover 13, and that for receiving replaceable measuring body 3 and the measuring shaft 2, a coupling system 6 is provided to the measuring motor 4. By way of an air inlet 10 which opens into the seal or passage 7 below the geometric seal and which is connected, for example, to the compressed air supply of the rheometer for powder fluidization, the entire geometric seal can be flushed with air by blowing in or sucking it through this air. The air supply and the seal are preferably designed concentrically symmetrical in order to influence the measurement as little as possible.
    The limited by the cylindrical measuring cup 1 and the cover 13 measuring chamber 30 is vented through an exhaust duct 23. Here too, a symmetrical guidance of the air flows can take place. At the outlet end of the exhaust duct 23 may be closed by an exchangeable and cleanable filter 45, which prevents the escape of swirled powder parts.
    A mechanical splash guard or screen 8 prevents as a geometric seal the direct impingement of powder particles with high kinetic energy in the area around the passage 7 of the cover 13 and a arrival of powder particles in the opening 25, and protects both the labyrinth seal and the fluid seal.
    Directly in approximately parallel direction to the measuring axis or measuring shaft 2 accelerated powder particles of high kinetic energy can be prevented from the fluid seal or geometric seal 7 only with high fluid flow velocities. However, such high flow rates would influence the powder fluid formed in the measuring container 1 and the measurement results. The screen 8 solves this problem.
    The sealing system thus having a plurality of components comprises a gasket with fine channels or thin gaps 21 and the screen 8 optimally protects the measuring motor 4 and its bearings or the control unit 41 and the evaluation unit 40 as well as the normal force measuring unit, and even in the case of failure of the fluid seal the fine-meshed, fine-structure geometric powder dust trapped in this.
    By blowing in the air in the passage 7, a directed into the measuring container 1 air flow 47 is formed, which forms the sealing air seal. Preferably, a fine geometric structure in the region near the outside of the shaft passage ensures that the sealing air flows preferably in the direction of the measuring chamber or in the measuring container 1, and not on the fine geometric structure over to the outside. Depending on the geometry, the movement of this air flow 45 may additionally form a Bernoulli suppression in the sealing structure, and air is sucked in from outside the measuring chamber 30 through the sealing structure inwards. This air flow 45 flowing inwards through the sealing structure ensures that no aerosol reaches the sealing structure and thus does not contaminate the sealing structure. The screen 8 may be geometrically designed to maximize the Bernullian depression, as shown in FIG.
    By removing the measuring body 3 with the measuring shaft 2 and the screen 8, the elements of the sealing structure located on the measuring shaft 2 can be cleaned.
    Optionally, structures which form the geometric structure of the sealing bearing, e.g. in the form of plastic parts that are created by turning and / or milling or molding. Thus, the bearing components, which are moved by the measuring shaft 2, can be easily carried out by weight, and e.g. be pushed onto the measuring shaft 2. Structures can also be formed or applied in the regions of the cover 13 lying in the region of the passage 7.
    Alternatively, the measuring shaft 2 can be provided directly by turning and / or milling with the geometric structures for the seal.
    Optionally, for different, e.g. Aggressive or difficult to fluidize, powder exchangeable measuring body 3 and interchangeable, are adapted to the Meßkörßer 3 or powder sealing systems.
    It is also possible to measure in the measuring container 1 the pressure drop over the sample or the powder 20 during the fluidization, e.g. by means of pitot tube method.
    FIG. 2 shows a rheometer whose measuring container 1 is surrounded by a temperature-control chamber 26. The tempering chamber 26 comprises a cover 13 and a jacket and a bottom part. Here, the powder or dust protection in the cover 13 of the temperature control chamber 26 is integrated. The geometic seal is created here by interaction of the sealing geometry on the measuring shaft 2 and on the cover 13 of the temperature-control chamber 26 or the formation and course of the gap 21.
    The powder 20 in the measuring container 1 can be examined in the tempering chamber 26 under defined environmental conditions, e.g. Humidity, temperature. It is a vibration generator 19 indicated, which fluidizes the powder 20 located in the measuring container 1. However, a fluidization as shown in Fig. 1 is also conceivable here.
    The screen 8 on the measuring shaft 2 has a trapezoidal shape in cross-section here and covers the opening 25 of the seal or passage 7. The seal or passage 7 is designed in a comparable manner as in the embodiment of FIG. 1.
    Optionally, the tempering chamber 26 may include an outlet 23 for exhaust air with a filter assembly 23 'through which the sealing fluid entering the tempering chamber 26 through the passageway 7 may be discharged with a suction unit 41 as indicated by arrow 22.
    FIGS. 3a, b and c show different seal geometries for feedthroughs 7 with an air guide along the measuring shaft 2 in cooperation with a dust cover or a cover 13 of a measuring container 1 or a tempering chamber 26.
    Fig. 3a shows a located on the measuring axis screen 8, which forms together with the cover 13, the gap 21 for the fluid seal. As an additional geometric fine structure is here (at least one) fine geometric structure, such as a groove 21 a integrated into the cover 13.
    Figure 3 b shows an arrangement with a fine structure, which is supported by both the cover 13 and the measuring shaft 2. The geometric structures 21b carried by the measuring shaft 2 together with the surrounding structure of the cover 13 form a narrow gap 21. This can be used directly for the supply of air as described in FIG. 2, or the supply takes place as in FIG describe with a not shown here channel for the fluid supply.
    If the geometric fine structure, e.g. a labyrinth seal, designed with a fine angled gap 21, which is formed by cover 13 and the sealing structure on the measuring shaft 2, the cover 13 must be made in two parts and can close around the measuring shaft according to the arrows to a change of the measuring waves. 2 and allow the measuring body 3.
    Figure 3 c shows an embodiment of the guide 7, which forms the screen 8 by Verjuegung the measuring shaft 2 on the bushing 7. At most, here, the fluid seal can be formed by fluid feeds 12 on the cover 13. Again, the cover 13 must be made of several parts to remove the measuring shaft 2 can. The screen 8 is formed by the measuring shaft 2.
    Figure 4 shows an arrangement in which the screen 8 is geometrically designed to maximize Bernouller depression. In addition to the geometric seal, the directed air flow 45 ensures that no aerosol reaches the sealing structure and thus does not contaminate the sealing structure. The leadership of the directed air flow 45 at approximately right angles to the opening 25 of the non-contact implementation of the measuring shaft 2 or to the gap formed between the underside of the cover 13 and the screen 8 46 maximizes before the gap 46 the negative pressure and thus the Bernoulli effect and leads to a strong directed flow of the passage 7 through which air flows into the measuring chamber or the measuring container 1 into it. The supply of the air flow 45 via a formed in the cover 13 channel 50th
    The rounded surface 47 at the upper end portion of the screen 8 supports the air flow 45 and the formation of a negative pressure.
    The combination of a geometric seal with a sealing air seal is optimal for retaining the fine fraction of the aerosol. The seal used has a gap of only a few tenths of a millimeter between the cover of the container or its dust cover and the measuring system shaft or the measuring shaft 2. The sealing air seal comprises a gap or a supply opening for a fluid on the inside of the cover or dust cover or the cover of the enveloping housing into which or flows a directed inward into the container, preferably uniform, air flow is maintained or maintained, which blows away the fines constantly from the gap or the feed opening and the measuring shaft 2, but still the Measurement only negligibly influenced.
    Preferably, the geometric seal or the fine labyrinth-like structure on the motor side along or above the implementation of the measuring shaft, i. also performed above a fluid supply for the fluid seal, wherein the fluid seal already returns the majority of the fines content of the powder into the interior of the measuring container.
    In principle, the interlocking of the geometric structure does not necessarily mesh with each other in the manner of a labyrinth seal and no " classic " Form labyrinth seal as shown in Fig. 3b. When air or fluid flows through the gap of the seal from the receiving space or from the interior of the measuring container 1 to the outside, the air flow should be offered as high a resistance as possible. The combination of fluid flow and gap width must be chosen appropriately so that the speed of the purge gas has such a high kinetic energy to reliably keep the aerosol and the powder particles contained therein out of the area of the shaft passage. A thin gap (a few millimeters, preferably a few tenths of a millimeter) and a purge gas velocity of a few m / s provides for this high resistance, especially with powders of a particle size of a few nanometers to particles in the order of the gap width. The person skilled in the art can choose an optimum compromise between gap width and purge gas velocity, depending on the rheometer properties. Additional grooves and / or shoulders in the cross section of the seal and / or on the measuring shaft 2 - see FIGS. 3a, 3b, 3c - make it difficult for the aerosol to flow through the shaft passage and also prevent the formation of a laminar flow out of the measuring chamber. Preferably, the purge gas supply line is selected in the implementation so that the gas inlet below the geometric seal or the grooves takes place and the incoming air preferably flows in the direction of the measuring chamber. The air particles or the aerosol can not flow straight or unhindered through the gap from the measuring chamber, but are additionally blocked by forming eddies in the grooves. It is a geometric seal because the fluidization medium, which contains the fines of the powder as a suspended matter, can not or hardly pass through this type of passage.
    Such geometric barriers are particularly suitable for retaining particles having a particle size much smaller than the passage gap width.
    Preferably, a splashguard or screen can be used, which covers the opening for the passage of the measuring shaft through the cover of the exhibition holder and is supported by the measuring shaft 2 or the measuring container 1. This screen 8 protects the gap of the seal or the implementation also before thrown out of the powder bed large, heavy powder particles with high directed kinetic energy.
    According to the invention, a combination of both geometrical components, namely of a screen 8 and a seal having a thin gap, is optionally used in combination with an at least partially fluid-sealed envelope housing around the measuring shaft or the measuring container.
    The Tempeprierung the powder sample, for example, by a climate chamber whose implementation forms the proposed combination of fluid seal and geometrical powder lock, or tempering directly on the measuring container 1 and / or on the cover 13 of the measuring container 1 or by supplying tempered, moist gases for the Fluidization are performed.
    Essential is the combination of a fluid seal with additional geometric means or sealing structures. The fluid seal is formed essentially exclusively by the simple feedthrough gap for the measuring shaft 2 with a throughflow. In order to reliably prevent the flow of powder or dust and particles with high kinetic energy, this fluid seal is combined with other geometric means. On the one hand, this can be the screen 8, which also has the function of limiting the inflow toward the sample or measuring body 3, or, on the other hand, the fine structure with grooves up to the geometry of a labyrinth seal. For a powder rheometer, it is necessary to use the fluid seal in combination with other geometric sealing arrangements. Preferred is a combination of all three variants described comprising the screen 8 for the high-energy, large particles and a fine structure for the smaller particles and dust particles and the fluid seal. This ensures that no dust gets into the sensitive rheometer - indicated in the drawings with the measuring motor.
    The fine structure can be arranged either above or below the fluid supply line, preferably above the fluid supply line as shown in FIGS. 1 and 4.
    权利要求:
    Claims (13)
    [1]
    1. rotary rheometer for measuring powdery or granular materials, comprising a measuring container (1) for receiving the material to be measured (20), a cover (13) for the measuring container (1), one on one of a measuring shaft (2) held measuring body (3), wherein the measuring body (3) and the container (1) are rotatable relative to each other, wherein the measuring shaft (2) friction, in particular contactless, through the cover (13) is guided and an outside of the measuring container (1) arranged evaluation (40) for evaluating the measured values taken from the measuring shaft (2), characterized in that for sealing the bearing gap 21 or the passage (7) of the measuring shaft (2) in or through the cover (13) into the measuring container (1) Both a fluid seal with a sealing fluid supply line and at least one cooperating with this fluid seal geometric seal are provided as a powder barrier.
    [2]
    2. rotary rheometer according to claim 1, characterized in that the measuring shaft (2) and the cover (13) together as a geometric powder barrier a fine sealing structure, preferably a labyrinth seal, form.
    [3]
    3. rotary rheometer according to claim 1 or 2, characterized in that the fluid seal comprises a to the measuring container (1) connected means (41) for generating a negative pressure with which through the gap (21) of the passage (7) between the measuring shaft ( 2) and the cover (13), in particular in the region below a geometric powder barrier, outside air or sealing gas in the measuring container (1) is sucked.
    [4]
    4. rotary rheometer according to one of claims 1 to 3, characterized in that as a fluid seal in the region of the passage (7) between the geometric powder barrier and the interior of the measuring container (1), in particular in the cover (13) or the implementation (7 ) of the measuring shaft (2), a supply line (12) for supplying a gas pressure in the measuring container (1) exceeding pressure having sealing gas opens.
    [5]
    5. rotary rheometer according to one of claims 1 to 4, characterized in that as geometrical powder barrier of the measuring shaft (2) within the measuring container (1) a screen (8) is worn, the surface extension perpendicular to the measuring shaft (2) the opening (25 ) of execution (7) surmounted on all sides.
    [6]
    6. rotary rheometer according to one of claims 1 to 5, characterized in that the screen (8) at a distance from the passage (7), which distance is smaller than the diameter, preferably the radius, the passage (7) or that the screen (8) is located at least partially in the passage (7).
    [7]
    7. rotary rheometer according to claim 5 or 6, characterized in that the screen (8) extends parallel to the opening (45) of the passage (7).
    [8]
    8. rotary rheometer according to one of claims 1 to 7, characterized in that the measuring shaft (2) friction, in particular without contact, passed through the cover (13).
    [9]
    9. rotary rheometer according to one of claims 1 to 8, characterized in that a unit for fluidizing the material to be measured (20) in the measuring container (1) is provided or connected thereto.
    [10]
    10. rotary rheometer according to one of claims 1 to 9, characterized in that at least one or more outflow opening (s) (46) of a sealing fluid supply on the underside of the cover (13) in the vicinity of the passage (7) of the measuring shaft (2) and / or above the screen (8).
    [11]
    11. Rotary rheometer according to claim 10, characterized in that the sealing fluid is flowed through the outflow opening (46) under pressure or by drawing a negative pressure in the measuring container (1) is sucked into this.
    [12]
    12. rotary rheometer according to claim 10 or 11, characterized in that the outflow opening of a measuring shaft (2) surrounding the gap (46) is formed.
    [13]
    13. rotary rheometer according to one of claims 1 to 12, characterized in that as a geometric seal grooves (21 a) in the cover (13) and / or the measuring shaft (2) are formed.
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    同族专利:
    公开号 | 公开日
    US10031057B2|2018-07-24|
    EP3067684B1|2021-02-24|
    AT516405B1|2016-05-15|
    US20160266022A1|2016-09-15|
    CN105973755A|2016-09-28|
    EP3067684A1|2016-09-14|
    CN105973755B|2021-10-29|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50196/2015A|AT516405B1|2015-03-11|2015-03-11|rotational rheometer|ATA50196/2015A| AT516405B1|2015-03-11|2015-03-11|rotational rheometer|
    EP16157981.8A| EP3067684B1|2015-03-11|2016-03-01|Rotating rheometer|
    US15/067,425| US10031057B2|2015-03-11|2016-03-11|Rotational rheometer for measuring powdery or granular materials|
    CN201610138317.0A| CN105973755B|2015-03-11|2016-03-11|Rheometer|
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