Viscosity testing system with thermal insulation transmission mechanism

Abstract

The utility model belongs to the technical field of experimental instrument matching devices, and particularly relates to a viscosity testing system with a heat preservation transmission mechanism, which comprises an outer channel and an inner channel arranged in an inner cavity of the outer channel, an electric heating wire is wound on the outer surface of the inner channel, and two axial ends of the inner channel are opened; the device further comprises a sliding rail penetrating through the inner channel in parallel, a lead screw penetrating through the inner channel in parallel is arranged under the sliding rail, the axial end of the lead screw is in transmission connection with a driving motor, the sliding rail is sleeved with a sliding block capable of sliding in a reciprocating fit mode in a matched mode, and the sliding block is arranged on the lead screw in a threaded fit mode. A limiting groove used for containing the volumetric flask is formed in the upper surface of the sliding block.

Description

Technical Field

[0001] The utility model belongs to the technical field of experimental instrument matching devices, and particularly relates to a viscosity testing system with a heat preservation transmission mechanism. Background Technique

[0002] The molecular weight of a polymer has a great influence on its properties and is one of the basic parameters characterizing the polymer. The molecular weight of a polymer is determined by the viscosity method, which has simple equipment, easy operation to master, and relatively high accuracy of results. The viscosity method mainly includes the capillary method, the rotating cylinder method, and the falling ball method. Among them, the capillary method is the most convenient and widely used. In the capillary method, an Ubbelohde viscometer is mainly used. The Ubbelohde viscometer is vertically fixed in a constant temperature water bath. During detection, the polymer solution is sucked into the Ubbelohde viscometer, and at the same time, the falling through time between the polymer solution and a fixed height distance above the capillary of the Ubbelohde viscometer is observed and recorded. Thus, the viscosity and molecular weight of the polymer can be deduced through the internal friction existing when the polymer solution flows. The greater the internal friction, the higher the viscosity and molecular weight.

[0003] Polymers often need to be fully dissolved and dispersed into a homogeneous solution in an organic solvent and at a relatively high dissolution temperature. After the organic solvent is heated, it has a strong smell and is harmful to the health of experimental personnel. Therefore, the preparation of polymer samples into solutions needs to be completed in a fume hood in the laboratory and then transferred to the Ubbelohde viscometer for detection. However, during the transfer process, the polymer solution will cool down and polymer precipitation will occur, affecting the detection accuracy. For example, for PE and PP, the solution temperature required for entering the Ubbelohde viscometer for testing is above 135°C, while the heating temperature for preparing PE and PP solutions is generally controlled at about 150°C (too high a temperature will cause problems such as polymer degradation and serious solvent volatilization, significantly affecting the detection accuracy). In many cases, it is impossible to ensure that the temperature of the prepared PE and PP solutions remains above 135°C when transferred to the Ubbelohde viscometer. Content of the Utility Model

[0004] To solve the above technical problems, the utility model provides a viscosity testing system with a heat preservation transmission mechanism, which includes a heat preservation transmission channel, a fume hood, and a viscosity detection device. The heat preservation transmission channel is fixedly installed between the fume hood and the viscosity detection device and extends outward in the fume hood along its own transmission direction to be close to the viscosity detection device;

[0005] The heat-insulating transmission channel includes an outer channel with a horizontal axis. An inner channel is coaxially arranged in the inner cavity of the outer channel. There is a spaced arrangement between the inner channel and the outer channel along the circumferential direction of its own radial direction. The inner channel is evenly wound with heating wires on its outer surface along its own axis. Both ends of the inner channel in the axial direction are open. The two ends of the inner channel in the axial direction are respectively fixedly connected to the peripheries of the corresponding ports of the outer channel through connecting plates in a circumferentially outward manner (realizing the suspended coaxial fixed setting of the inner channel in the inner cavity of the outer channel through the connecting plates). The plate surface of the connecting plate is perpendicular to the axis of the inner channel. The two ends of the heating wire in the length direction extend out of the outer channel and cooperate to form an electric circuit to realize the energization and heating of the heating wire;

[0006] The heat-insulating transmission channel further includes a slide rail that passes through the inner channel parallel to its own length direction, and both ends of the slide rail in the length direction extend out of the inner channel respectively. There is a lead screw directly below the slide rail, and the length direction of the lead screw is parallel to that of the slide rail and also passes through the inner channel in parallel. One end of the lead screw in the axial direction is in transmission connection with the output end of the driving motor. A slider that can reciprocally slide along the length direction of the slide rail is sleeved on the slide rail in a matching manner. The slider is simultaneously threadedly sleeved on the lead screw. The driving motor drives the lead screw to rotate axially, thereby threadedly driving the slider to slide synchronously on the slide rail in a matching manner. A limiting groove for accommodating a volumetric flask is vertically recessed in the middle of the horizontal upper surface (rectangular plane) of the slider.

[0007] Preferably: Both the outer channel and the inner channel are in a positive-set rectangular shape in the radial direction.

[0008] Preferably: At a position on the outer channel near one end of its length direction, it is fixedly connected to the workbench surface of the fume hood through a first fixing seat; at a position on the outer channel near the other end of its length direction, it is fixedly connected to the workbench surface where the viscosity detection device is placed through a second fixing seat.

[0009] Furthermore: The first fixing seat includes a first vertical plate with a plate surface bolt-fixed to the workbench surface of the fume hood and perpendicular to the axis of the inner channel. On the side plate surface of the first vertical plate facing the outer channel, there is a horizontally extending first support plate for upwardly abutting and supporting the outer channel. The first support plate is fixedly connected to the outer channel through bolts; the second fixing seat includes a second vertical plate with a plate surface bolt-fixed to the workbench surface where the viscosity detection device is placed and perpendicular to the axis of the inner channel. On the side plate surface of the second vertical plate facing the outer channel, there is a horizontally extending second support plate for upwardly abutting and supporting the outer channel. The second support plate is fixedly connected to the outer channel through bolts.

[0010] Furthermore: The driving motor is fixedly installed on the side plate surface of the first vertical plate away from the first support plate.

[0011] Further: One end of the lead screw close to the driving motor in the length direction is axially rotatably fitted through the second vertical plate by means of a bearing, and then is drivingly connected to the output end of the driving motor through a coupling; One end of the lead screw far from the driving motor in the length direction is axially rotatably connected to the first vertical plate through a bearing.

[0012] During use, first energize the heating wire to generate heat, so that a certain high temperature is reached in the inner cavity of the inner channel. At the same time, drive the slider to slide along the slide rail to an appropriate position to extend out of the inner channel at the side of the fume hood through the driving motor, which is convenient for smoothly fitting the volumetric flask into the limiting groove. However, at this time, it is also necessary to control that the slider does not extend out of the inner channel too much. Because in the case of one person operating the experiment throughout the process, after the volumetric flask is loaded into the limiting groove, the experimenter needs to walk to the other end in the length direction of the heat preservation transmission channel, that is, near the viscosity detection device, and then start the driving motor to drive the slider to carry the volumetric flask over for sampling and detection. If the volumetric flask on the slider is too far away from the high-temperature inner cavity of the inner channel during the experimenter's walking process, it will also cause the temperature of the polymer solution in the volumetric flask to drop rapidly during this period.

[0013] If one person operates the experiment throughout the process, after the above preparations are completed, heat and prepare the polymer solution in the fume hood, (wear heat-resistant gloves) and then place the volumetric flask containing the polymer solution in the limiting groove while it is hot. Then walk to the vicinity of the workbench of the viscosity detection device and drive the slider together with the volumetric flask to be transmitted in the inner channel through the driving motor. Since the volumetric flask is transmitted in the high-temperature inner channel, it avoids the polymer solution to be measured in the volumetric flask from cooling down. And control that the slider carrying the volumetric flask does not extend out of the inner channel too much near the viscosity detection device. In this way, when taking the liquid from the polymer solution in the volumetric flask with a pipette, the temperature drop of the solution in the volumetric flask can also be greatly slowed down, and then transfer the solution taken by the pipette to the viscosity detection device for testing. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the viscosity testing system with a heat preservation transmission mechanism of the present utility model.

[0015] Among them, 10 - fume hood,

[0016] 20 - heat preservation transmission channel, 21 - outer channel, 22 - inner channel, 23 - heating wire, 24 - slide rail, 25 - lead screw, 26 - driving motor, 27 - slider, 271 - limiting groove, 28 - connecting plate, 29 - first fixing seat, 291 - first vertical plate, 292 - first support plate, 210 - second fixing seat, 2101 - second vertical plate, 2102 - second support plate,

[0017] 30 - viscosity detection device,

[0018] 40 - Volumetric flask, 41 - Bolt. Detailed implementation

[0019] It should be noted that the direction limiting words "horizontal" and "vertical" used in the description of the present utility model refer to the directions in the attached Figure 1 . The "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0020] As shown in the attached Figure 1 , the viscosity testing system with a heat preservation transmission mechanism of the present utility model includes a heat preservation transmission channel 20, a fume hood 10, and a viscosity detection device 30. The heat preservation transmission channel 20 is fixedly installed between the fume hood 10 and the viscosity detection device 30, and extends outward in the fume hood 10 along its own transmission direction to be close to the viscosity detection device 30. The heat preservation transmission channel 20 includes an outer channel 21 with a horizontal length direction. The outer channel 21 is always in a positive rectangular shape in the radial cross-section. The outer channel 21 extends from inside the fume hood 10 through the fixed side wall of the fume hood 10 (such as Figure 1 , the front of the fume hood 10 is the position of its lifting door) and reaches a position close to the viscosity detection device 30. At a position on the outer channel 21 close to one end of its length direction, it is fixedly connected to the horizontal workbench surface of the fume hood 10 through a first fixing seat 29. The first fixing seat 29 includes a first vertical plate 291 fixedly installed on the horizontal workbench surface of the fume hood 10 through a bolt 41, and the plate surface of the first vertical plate 291 is perpendicular to the length direction of the outer channel 21. On the side plate surface of the first vertical plate 291 facing the outer channel 21, there extends outward a first support plate 292 with a horizontal plate surface for upwardly abutting and supporting the outer channel 21. The first support plate 292 is fixedly connected to the bottom wall of the outer channel 21 through a bolt 41; at a position on the outer channel 21 close to the other end of its length direction, it is fixedly connected to the horizontal workbench surface where the viscosity detection device 30 is placed through a second fixing seat 210. The second fixing seat 210 includes a second vertical plate 2101 fixedly installed on the horizontal workbench surface where the viscosity detection device 30 is placed through a bolt 41, and the plate surface of the second vertical plate 2101 is perpendicular to the length direction of the outer channel 21. On the side plate surface of the second vertical plate 2101 facing the outer channel 21, there extends outward a second support plate 2102 with a horizontal plate surface for upwardly abutting and supporting the outer channel 21. The second support plate 2102 is fixedly connected to the bottom wall of the outer channel 21 through a bolt 41;

[0021] An inner channel 22 is coaxially arranged in the inner cavity of the outer channel 21. The inner channel 22 is also always in a rectangular shape in a radial cross section. The inner channel 22 is always spaced apart from the inner cavity wall of the outer channel 21 along its own radial annular direction outward. Both ends of the inner channel 22 in the length direction are opened. The ports at both ends of the inner channel 22 in the length direction are respectively fixedly connected to the circumference of the corresponding ports of the outer channel 21 in annular direction outward through connecting plates 28 with vertical plate surfaces. The plate surface of the connecting plate 28 is perpendicular to the length direction of the inner channel 22 (outer channel 21). The inner channel 22 is suspended and coaxially fixed in the inner cavity of the outer channel 21 through the support of the connecting plates 28 at both ends of the length direction of the inner channel 22. The inner channel 22 is evenly wound with a heating wire 23 on its outer surface along its own length direction. After the two ends of the heating wire 23 in the length direction extend outward from the outer channel 21, they can cooperate to form an energized circuit to realize the energization and heating of the heating wire 23.

[0022] The heat preservation transmission channel also includes a horizontal slide rail 24 that passes through the inner channel 22 in parallel along its own length direction. The slide rail 24 is a rectangular parallelepiped structure that is arranged in a positive manner. One end of the slide rail 24 along its own length direction is fixedly connected to the first vertical plate 291, and the other end is fixedly connected to the second vertical plate 2101. Both ends of the slide rail 24 in the length direction extend horizontally outward from the inner channel 22 respectively. A lead screw 25 is provided directly below the slide rail 24, and its length direction is parallel to the slide rail 24 and also passes through the inner channel 22 in parallel. The drive motor 26 is fixedly installed on a side plate surface of the second vertical plate 2101 away from the second support plate 2102. One end of the lead screw 25 in its own length direction extends horizontally and passes through the second vertical plate 2101 through a bearing (not drawn in the attached drawings) to axially rotate and then passes through a coupling (not drawn in the attached drawings). It is transmission connected to the output end of the drive motor 26. The end of the lead screw 25 away from the drive motor 26 in the length direction is horizontally extended and axially rotatably connected to the first vertical plate 291 through a bearing (not shown in the accompanying drawings). A slider 27 is provided on the slide rail 24 and can slide back and forth along the length direction of the slide rail 24. The slider 27 is a block-shaped rectangular structure that is properly set. The slider 27 is also threadedly sleeved on the lead screw 25. The drive motor 26 drives the lead screw 25 to rotate axially between the first vertical plate 291 and the second vertical plate 2101, so that the threaded drive slider 27 is engaged with the slide rail 24 and slides synchronously along the length direction of the slide rail 24. The center of the horizontal upper surface of the slider 27 is vertically recessed downward to form a limit groove 271 for accommodating the volumetric bottle 40.

[0023] During use, first energize the heating wire 23 to generate heat, so that a certain high temperature is reached in the inner cavity of the inner channel 22. At the same time, drive the motor 26 to make the slider 27 slide along the slide rail 24 to appropriately extend out of the channel opening on one side of the inner channel 22 located in the fume hood 10, which facilitates the smooth fitting of the volumetric flask 40 into the limit groove 271. However, at this time, it is also necessary to control that the slider 27 does not extend out of the inner channel 22 too much (such as the position in the attachment Figure 1 ), because in the case of one person operating the experiment throughout the process, after the volumetric flask 40 is placed in the limit groove 271, the experimenter needs to walk to the other end in the length direction of the heat preservation transfer channel 20, that is, near the viscosity detection device 30, and then start the drive motor 26 to transfer the slider 27 with the volumetric flask 40 over for sampling and detection. If the volumetric flask 40 on the slider 27 is too far away from the inner cavity of the high-temperature inner channel 22 during the walking process of the experimenter, it will also cause the temperature of the polymer solution in the volumetric flask 40 to drop rapidly during this period;

[0024] If one person operates the experiment throughout the process, after the above preparations are completed, heat and prepare the polymer solution in the fume hood 10, (wear heat-resistant gloves) and then place the volumetric flask 40 containing the polymer solution in the limit groove 271 while it is still hot. Then walk to the vicinity of the workbench of the viscosity detection device 30, and drive the motor 26 to transfer the slider 27 together with the volumetric flask 40 in the inner channel 22. Since the volumetric flask 40 is transferred in the high-temperature inner channel 22, it avoids the cooling of the polymer solution to be measured prepared in the volumetric flask 40, and controls that the slider 27 does not extend out of the inner channel 22 too much when carrying the volumetric flask 40 near the viscosity detection device 30. In this way, when taking the liquid from the polymer solution in the volumetric flask 40 with a pipette, the temperature drop of the solution in the volumetric flask 40 can also be greatly slowed down, and then transfer the solution taken by the pipette to the viscosity detection device 30 for testing.

Claims

1. A viscosity testing system with a heat preservation transmission mechanism, characterized in that: The system comprises a fume hood (10), a heat-insulating transmission channel (20), and a viscosity detection device (30); the heat-insulating transmission channel (20) is fixedly installed between the fume hood (10) and the viscosity detection device (30), and extends outward from the inside of the fume hood (10) along its own transmission direction to a position close to the viscosity detection device (30); The heat preservation transmission channel (20) comprises an outer channel (21), an inner channel (22) is arranged in the inner cavity of the outer channel (21), the inner channel (22) is arranged in an outward direction along its own radial direction with a spacing between the outer channel (21), the inner channel (22) is wound with a heating wire (23) on the outer surface along its own axial direction, and the two ends of the heating wire (23) in the length direction extend outward from the outer channel (21) to form an electric circuit to realize the heating of the heating wire (23) by electricity, and the two ends of the inner channel (22) in the axial direction are both opened; The heat-insulating transmission channel (20) further comprises a slide rail (24) which passes through the inner channel (22) in parallel along its length direction, and both ends of the slide rail (24) in the length direction respectively extend outward from the inner channel (22). A lead screw (25) which passes through the inner channel (22) in parallel with the slide rail (24) in the length direction is provided directly below the slide rail (24). One axial end of the lead screw (25) is drivingly connected to the output end of the drive motor (26). The slide rail (24) is provided with a matching sleeve. A slider (27) is provided which can slide back and forth along the length direction of the slide rail (24). The slider (27) is threadedly sleeved on the lead screw (25). The drive motor (26) drives the lead screw (25) to rotate axially, thereby threadingly driving the slider (27) to slide synchronously on the slide rail (24) along the length direction of the slide rail (24). The upper surface of the slider (27) is recessed downward to form a limit groove (271) for accommodating a volumetric bottle (40).

2. The viscosity testing system with a heat preservation transmission mechanism according to claim 1, characterized in that: The axial end ports of the inner channel (22) are respectively fixedly connected outwardly in an annular direction to the circumference of the corresponding ports of the outer channel (21) through connecting plates (28).

3. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 1, characterized in that: The outer channel (21) is located near one end in the length direction and is fixedly connected to the workbench surface of the fume hood (10) via a first fixing seat (29).

4. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 3, characterized in that: The first fixing seat (29) comprises a first vertical plate (291) fixedly mounted on a workbench surface of the fume hood (10) by bolts, and a first supporting plate (292) for supporting the outer channel (21) protrudes outward from a side plate surface of the first vertical plate (291) facing the outer channel (21) and is used to support the outer channel (21) upward, and the first supporting plate (292) is fixedly connected to the outer channel (21) by bolts.

5. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 4, characterized in that: The outer channel (21) is fixedly connected to a workbench surface on which the viscosity detection device (30) is placed, at a position close to the other end in the length direction thereof, via a second fixing seat (210).

6. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 5, characterized in that: The second fixing seat (210) comprises a second vertical plate (2101) fixedly mounted by bolts on a workbench surface on which the viscosity detection device (30) is placed, and a second supporting plate (2102) extending outwards from a side plate surface of the second vertical plate (2101) facing the outer channel (21) and used for supporting the outer channel (21) upwards, and the second supporting plate (2102) is fixedly connected to the outer channel (21) by bolts.

7. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 6, characterized in that: The driving motor (26) is fixedly mounted on a side surface of the second vertical plate (2101) away from the second supporting plate (2102).

8. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 7, characterized in that: One end of the lead screw (25) in the length direction close to the drive motor (26) is axially rotatably fitted through a bearing to pass through the second vertical plate (2101), and then is transmission-connected to the output end of the drive motor (26) through a coupling; and one end of the lead screw (25) in the length direction away from the drive motor (26) is axially rotatably fitted to the first vertical plate (291) through a bearing.

9. The viscosity testing system with a heat preservation transmission mechanism as claimed in claim 1, characterized in that: The outer channel (21) and the inner channel (22) are both in a rectangular shape arranged in a radial direction.

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