Rheometer

Abstract

The utility model relates to the technical field of rheometers, in particular to a rheometer, which comprises a machine body, the upper surface of the machine body is provided with a testing mechanism for conveniently adjusting flow measurement, and the upper surface of the machine body is provided with a heating mechanism for heating a flow measurement sample of the testing mechanism. According to the rheometer, through the arrangement of the testing mechanism and the mutual cooperation of the lifting assembly, the servo motor, the rotating shaft, the replacement assembly and the like, firstly, the lifting assembly is used for driving the fixing box connected with the supporting arm and the replacement assembly to be subjected to lifting adjustment, and meanwhile, after a monitoring probe is brought into a sample, the sample is replaced; a shear force is rotatably applied in a tested substance, the deformation response of the substance is measured, the rheological measurement effect is achieved, a connecting shaft with a proper monitoring probe is selected according to sample characteristics, the connecting shaft is firstly connected with a connecting bolt, then the bolt is screwed into a fixing screw hole, assembling is completed, the corresponding probe can be rapidly replaced, and the testing efficiency is improved. And the concentric precision is high to adapt to the characteristics of different samples, and is convenient to adapt to the change of a rheological system.

Description

Technical Field

[0001] The present application relates to the technical field of rheometers, and in particular to a rheometer. Background Art

[0002] Rheometers are used to measure the rheological properties of polymer melts, solutions, suspensions, emulsions, coatings, inks, and foods. Rheological measurements provide a window into the internal structure of polymer materials. By analyzing the response of molecular chains at different scales within polymers such as plastics, rubbers, and resins, molecular weight and molecular weight distribution can be characterized. This allows for rapid, simple, and effective quality testing and control of raw materials, intermediates, and final products. Rheological measurements bridge the gap between polymer molecular weight, molecular weight distribution, and branching with processing performance, providing a direct link that helps users inspect raw materials, design processing techniques, and predict product performance.

[0003] For example, a rheometer device disclosed in Chinese Patent Publication No. (CN210322682U) includes: a base, on which a heating plate is provided, and the heating plate is used to heat the object to be tested to a predetermined temperature; a bracket fixed to the base, on which a detection mechanism is provided, and the detection mechanism is located on the upper side of the heating plate, and the detection mechanism is used to detect the object to be tested; an anti-heat dissipation device, which has a hollow cavity and is arranged on the base to enclose the heating plate and the object to be tested within the cavity; a detection channel is provided at the upper end of the heat dissipation device, and the detection mechanism passes through the detection channel to detect the object to be tested. The device encloses the heating plate in a confined space, effectively preventing heat loss, allowing the object to be tested to be tested in an environment with a preset temperature, and improving the validity of the rheometer test results.

[0004] However, as in the above patent, there is still a problem of poor convenience in adjusting and replacing the flow measuring probes for different samples. For example, in the above patent, a detection mechanism is set on the bracket, and the detection mechanism is extended into the object to be tested to rotate and monitor the rheological data. However, different samples have different rheological systems due to different media, and corresponding probes need to be used. If this method is used, it is difficult to quickly replace the detection probe and the bracket, which is not convenient for adapting to the characteristics of different samples and adapting to changes in the rheological system. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the present application provides a rheometer with advantages such as convenient flow measurement adjustment and replacement, which solves the problem of poor convenience in adjusting and replacing flow measurement probes for different samples.

[0006] To achieve the above-mentioned object, the present application provides the following technical solution: a rheometer, comprising a body, an upper surface of which is provided with a testing mechanism for convenient flow measurement and adjustment, and an upper surface of which is provided with a heating mechanism for heating a flow measurement sample of the testing mechanism;

[0007] The testing mechanism includes a lifting assembly, a fixed box, a servo motor and a rotating shaft. The lifting assembly is arranged on the upper surface of the machine body and is used to drive the fixed box. The servo motor is fixed to the inner bottom wall of the fixed box. One end of the rotating shaft is fixed to the output shaft of the servo motor. The testing mechanism also includes a replacement assembly arranged at the other end of the rotating shaft and used for disassembly and assembly with the rotating shaft.

[0008] This technical solution allows the monitoring probe to be lowered into the sample via a lifting assembly. The servo motor is then activated, and the output shaft drives the rotating shaft, causing the monitoring probe to rotate within the sample. The servo motor can change its speed to suit the probe test. The monitoring probe can then rotate within the test material, applying shear forces and measuring the material's deformation response, achieving rheological measurements.

[0009] Furthermore, the lifting assembly includes a mounting frame, a driving motor, a lifting screw and a support arm. The mounting frame is fixed to the upper surface of the machine body by bolts, the driving motor is fixed to the upper surface of the mounting frame, one end of the lifting screw is fixed to the output shaft of the driving motor, and the other end of the lifting screw is rotatably connected to the inner bottom wall of the mounting frame through a bearing, the support arm is threadedly connected to the lifting screw, and the support arm is fixed to the upper surface of the fixed box.

[0010] By adopting this technical solution, using the lifting assembly, the driving motor is started, and the lifting screw is driven to rotate through the output shaft, so that the lifting monitoring probe can be placed in the sample for monitoring and removed for replacement.

[0011] Furthermore, the lifting assembly also includes guide rails fixed to the inner walls on the left and right sides of the mounting frame, and sliding grooves are provided on the front and rear sides of the support arm, and the support arm is slidably connected to the guide rails through the sliding grooves.

[0012] By adopting this technical solution, the driving motor is started to drive the lifting screw to rotate, thereby driving the support arm to maintain vertical linear motion under the action of the guide rail.

[0013] Furthermore, the mounting frame is in the shape of a rectangular parallelepiped with a hollow interior and a missing front side, and a controller is fixed on the front side of the body.

[0014] By adopting this technical solution, the drive motor and servo motor can be centrally started through the controller.

[0015] Furthermore, the replacement assembly includes a connecting shaft, a monitoring probe and a connecting bolt. The monitoring probe is threadedly connected to the connecting bolt. The monitoring probe is fixed to the outer side of the connecting shaft. A fixing screw hole for installing the connecting shaft is provided at the bottom end of the rotating shaft. The connecting bolt is threadedly connected to the rotating shaft through the fixing screw hole.

[0016] By adopting this technical solution, a connecting shaft with a suitable monitoring probe is selected according to the characteristics of the sample, which is first connected to the connecting bolt and then the bolt is screwed into the fixing screw hole to complete the assembly. This method can quickly replace the corresponding probe, and has high concentricity accuracy to adapt to the characteristics of different samples, and is easy to adapt to changes in the rheological system.

[0017] Furthermore, the heating mechanism includes a heat insulation cover, an electromagnetic induction coil and a heating crucible. The upper surface of the body is provided with an installation opening for placing the heat insulation cover. The heat insulation cover is fixed to the inner wall of the installation opening, the electromagnetic induction coil is fixed to the inner wall of the heat insulation cover, and the heating crucible is placed inside the electromagnetic induction coil.

[0018] By adopting this technical solution, the heat insulation cover fixed to the body through the installation port can isolate the temperature and protect the body, as well as delay the loss of internal temperature.

[0019] Furthermore, a heater for activating the electromagnetic induction coil is provided inside the machine body.

[0020] By adopting this technical solution, after placing the heating crucible containing the sample inside the electromagnetic induction coil, the controller controls the amount of electrical energy transmitted to the heater, and by adjusting the intensity and frequency of the electromagnetic field, the intensity of the induced current can be changed, thereby adjusting the heating rate and temperature.

[0021] Furthermore, the electromagnetic induction coil is fixed on the inner wall of the heat insulation cover in a spiral shape, and the height of the electromagnetic induction coil is smaller than the height of the heating crucible.

[0022] By adopting this technical solution, the heated crucible can generate an effective induced current in the electromagnetic induction field and quickly convert it into thermal energy to control the environment around the sample to prevent external factors from affecting the experimental results. It also provides a wide adjustable temperature range to meet the testing requirements of different sample rheological properties.

[0023] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0024] 1. The rheometer is equipped with a testing mechanism. Through the cooperation between the lifting assembly, servo motor, rotating shaft and replacement assembly, the lifting assembly is first used to drive the lifting and adjustment of the fixed box and replacement assembly connected to the support arm. At the same time, after the monitoring probe is brought into the sample, it is rotated in the test material to apply shear force and measure the deformation response of the material to achieve the rheological measurement effect. According to the characteristics of the sample, a connecting shaft with a suitable monitoring probe is selected, connected to the connecting bolt and then screwed into the fixing screw hole to complete the assembly. The corresponding probe can be quickly replaced, and the concentricity accuracy is high to adapt to the characteristics of different samples and it is easy to adapt to changes in the rheological system.

[0025] 2. The rheometer is equipped with a heating mechanism, and the heat insulation cover, electromagnetic induction coil, heating crucible and mounting port cooperate with each other. After the heating crucible containing the sample is placed inside the electromagnetic induction coil, the amount of electric energy transmitted to the heater is controlled by the controller, and the intensity and frequency of the electromagnetic field are adjusted to change the intensity of the induced current, thereby adjusting the heating rate and temperature. The graphite heating crucible can generate an effective induced current in the electromagnetic induction field and quickly convert it into heat energy to control the environment around the sample to prevent external factors from affecting the experimental results. It also provides a wide adjustable temperature range to meet the testing requirements of the rheological properties of different samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of this application;

[0027] Figure 2 This is a schematic diagram of the testing organization for this application;

[0028] Figure 3 Exploded view of replacement components in the test facility for this application;

[0029] Figure 4 This is a schematic diagram of the heating mechanism of this application.

[0030] In the figure: 1. Machine body; 2. Testing mechanism; 21. Lifting assembly; 211. Mounting frame; 212. Driving motor; 213. Lifting screw; 214. Support arm; 215. Guide rail; 22. Fixing box; 23. Servo motor; 24. Rotating shaft; 25. Replacement assembly; 251. Connecting shaft; 252. Monitoring probe; 253. Connecting bolt; 254. Fixing screw hole; 3. Heating mechanism; 31. Heat shield; 32. Electromagnetic induction coil; 33. Heating crucible; 34. Mounting port. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] See also Figure 1 A rheometer in this embodiment includes a body 1, an upper surface of the body 1 is provided with a testing mechanism 2 for convenient flow measurement adjustment, and an upper surface of the body 1 is provided with a heating mechanism 3 for heating the flow measurement sample of the testing mechanism 2.

[0033] See also Figure 2-3 In order to improve the convenience of adjustment and replacement of the rheometer, the testing mechanism 2 in this embodiment includes a lifting assembly 21, a fixed box 22, a servo motor 23 and a rotating shaft 24. The lifting assembly 21 is arranged on the upper surface of the body 1 and is used to drive the fixed box 22. The servo motor 23 is fixed to the inner bottom wall of the fixed box 22. One end of the rotating shaft 24 is fixed to the output shaft of the servo motor 23. The testing mechanism 2 also includes a replacement assembly 25 arranged at the other end of the rotating shaft 24 and used for disassembly and assembly with the rotating shaft 24.

[0034] Among them, the lifting assembly 21 includes a mounting frame 211, a driving motor 212, a lifting screw 213 and a support arm 214. The mounting frame 211 is fixed to the upper surface of the body 1 by bolts, the driving motor 212 is fixed to the upper surface of the mounting frame 211, one end of the lifting screw 213 is fixed to the output shaft of the driving motor 212, and the other end of the lifting screw 213 is rotatably connected to the inner bottom wall of the mounting frame 211 through a bearing, the support arm 214 is threadedly connected to the lifting screw 213, and the support arm 214 is fixed to the upper surface of the fixing box 22.

[0035] It should be noted that, by using the lifting assembly 21 and starting the driving motor 212, the lifting screw 213 is driven to rotate via the output shaft, so as to facilitate the lifting of the monitoring probe 252 to be placed in the sample for monitoring and to be taken out for replacement.

[0036] The replacement component 25 includes a connecting shaft 251, a monitoring probe 252 and a connecting bolt 253. After the monitoring probe 252 is brought into the sample by the lifting component 21, the servo motor 23 can be started, and the output shaft drives the rotating shaft 24 to drive the monitoring probe 252 to rotate in the sample. The servo motor 23 can change the speed to adapt to the probe test. The monitoring probe 252 can rotate in the test material, apply shear force and measure the deformation response of the material to achieve rheological measurement. The monitoring probe 252 is threadedly connected to the connecting bolt 253. The measuring probe 252 is fixed to the outside of the connecting shaft 251. A fixing screw hole 254 for installing the connecting shaft 251 is provided at the bottom end of the rotating shaft 24. The connecting bolt 253 is threadedly connected to the rotating shaft 24 through the fixing screw hole 254. After the probe is raised, the connecting bolt 253 can be unscrewed to separate the connecting shaft 251 from the rotating shaft 24. According to the characteristics of the sample, the connecting shaft 251 with a suitable monitoring probe 252 is selected, connected to the connecting bolt 253 first, and then the bolt is screwed into the fixing screw hole 254 to complete the assembly.

[0037] In this embodiment, the lifting assembly 21 also includes guide rails 215 fixed on the inner walls on the left and right sides of the mounting frame 211. Slide grooves are provided on the front and rear sides of the support arm 214. The support arm 214 is slidably connected to the guide rails 215 through the slide grooves. The support arm 214 maintains vertical linear motion under the action of the guide rails 215, thereby driving the fixed box 22 and the replacement assembly 25 connected to the support arm 214 to move up and down. The mounting frame 211 is in the shape of a rectangular parallelepiped with a hollow interior and a missing front. A controller is fixed to the front of the body 1.

[0038] See also Figure 4 In order to heat the sample for use in the rheometer, the heating mechanism 3 in this embodiment includes a heat shield 31, an electromagnetic induction coil 32 and a heating crucible 33. The upper surface of the body 1 is provided with a mounting opening 34 for placing the heat shield 31. The heat shield 31 is fixed to the inner wall of the mounting opening 34. The heat shield 31 fixed to the body 1 through the mounting opening 34 can isolate the temperature and protect the body 1, as well as delay the loss of internal temperature. The electromagnetic induction coil 32 is fixed to the inner wall of the heat shield 31, and the heating crucible 33 is placed inside the electromagnetic induction coil 32. After the heating crucible 33 containing the sample is placed inside the electromagnetic induction coil 32, the amount of electric energy transmitted to the heater is controlled by the controller, and the intensity and frequency of the electromagnetic field can be adjusted to change the intensity of the induced current, thereby adjusting the heating rate and temperature.

[0039] In this embodiment, a heater for operating the electromagnetic induction coil 32 is provided inside the body 1. The electromagnetic induction coil 32 is spirally fixed to the inner wall of the heat insulation cover 31, and the height of the electromagnetic induction coil 32 is less than the height of the heating crucible 33. The heating crucible 33 made of graphite can generate an effective induced current in the electromagnetic induction field and quickly convert it into heat energy to control the environment around the sample to prevent external factors from affecting the experimental results, and provide a wide adjustable temperature range to meet the testing requirements of the rheological properties of different samples.

[0040] The working principle of the above embodiment is:

[0041] 1. When the rheometer is adjusted and replaced for convenience, the lifting assembly 21 is used to start the driving motor 212, and the lifting screw 213 is driven to rotate via the output shaft, thereby driving the support arm 214 to maintain vertical linear motion under the action of the guide rail 215, thereby driving the fixed box 22 and the replacement assembly 25 connected to the support arm 214 to move up and down, so as to facilitate the lifting of the monitoring probe 252 and place it in the sample for monitoring and take out the replacement probe for use. At the same time, after the monitoring probe 252 is brought into the sample by the lifting assembly 21, the servo motor 23 can be started, and the lifting assembly 212 can be used to move the monitoring probe 252 into the sample. The output shaft drives the rotating shaft 24 to drive the monitoring probe 252 to rotate in the sample. The servo motor 23 can change the speed to adapt to the probe test. The monitoring probe 252 can rotate in the test material, apply shear force and measure the deformation response of the material to achieve rheological measurement. After the probe is raised, the connecting bolt 253 can be unscrewed, and the connecting shaft 251 and the rotating shaft 24 can be separated. According to the characteristics of the sample, the connecting shaft 251 with a suitable monitoring probe 252 is selected, and it is first connected to the connecting bolt 253 and then the bolt is screwed into the fixing screw hole 254 to complete the assembly.

[0042] (2) When the rheometer is used to heat samples, the heat shield 31 fixed to the body 1 through the mounting port 34 can isolate the temperature and protect the body 1, as well as delay the loss of internal temperature. After the heating crucible 33 containing the sample is placed inside the electromagnetic induction coil 32, the amount of electric energy transmitted to the heater is controlled by the controller, and the intensity and frequency of the electromagnetic field can be adjusted to change the intensity of the induced current, thereby adjusting the heating rate and temperature. The graphite heating crucible 33 can generate an effective induced current in the electromagnetic induction field and quickly convert it into heat energy to control the environment around the sample to prevent external factors from affecting the experimental results, and provide a wide adjustable temperature range to meet the testing requirements of different sample rheological properties.

Claims

1. A rheometer, comprising a body (1), characterized in that: The upper surface of the body (1) is provided with a testing mechanism (2) for convenient flow measurement and adjustment, and the upper surface of the body (1) is provided with a heating mechanism (3) for heating a flow measurement sample of the testing mechanism (2); The testing mechanism (2) includes a lifting assembly (21), a fixed box (22), a servo motor (23) and a rotating shaft (24), wherein the lifting assembly (21) is arranged on the upper surface of the body (1) and is used to drive the fixed box (22), the servo motor (23) is fixed to the inner bottom wall of the fixed box (22), one end of the rotating shaft (24) is fixed to the output shaft of the servo motor (23), and the testing mechanism (2) further includes a replacement assembly (25) arranged at the other end of the rotating shaft (24) and used for disassembly and assembly with the rotating shaft (24).

2. A rheometer according to claim 1, characterized in that: The lifting assembly (21) comprises a mounting frame (211), a driving motor (212), a lifting screw (213) and a support arm (214); the mounting frame (211) is fixed to the upper surface of the machine body (1) by bolts; the driving motor (212) is fixed to the upper surface of the mounting frame (211); one end of the lifting screw (213) is fixed to the output shaft of the driving motor (212); and the other end of the lifting screw (213) is rotatably connected to the inner bottom wall of the mounting frame (211) by a bearing; the support arm (214) is threadedly connected to the lifting screw (213), and the support arm (214) is fixed to the upper surface of the fixing box (22).

3. A rheometer according to claim 2, characterized in that: The lifting assembly (21) further includes guide rails (215) fixed to the inner walls on the left and right sides of the mounting frame (211), and a slide groove is provided on both the front and rear sides of the support arm (214), and the support arm (214) is slidably connected to the guide rails (215) via the slide groove.

4. A rheometer according to claim 2, characterized in that: The mounting frame (211) is in the shape of a rectangular parallelepiped with a hollow interior and a missing front side, and a controller is fixed on the front side of the machine body (1).

5. A rheometer according to claim 1, characterized in that: The replacement assembly (25) includes a connecting shaft (251), a monitoring probe (252), and a connecting bolt (253). The monitoring probe (252) is threadedly connected to the connecting bolt (253). The monitoring probe (252) is fixed to the outer side of the connecting shaft (251). A fixing screw hole (254) for mounting the connecting shaft (251) is provided at the bottom end of the rotating shaft (24). The connecting bolt (253) is threadedly connected to the rotating shaft (24) through the fixing screw hole (254).

6. A rheometer according to claim 1, characterized in that: The heating mechanism (3) comprises a heat insulation cover (31), an electromagnetic induction coil (32) and a heating crucible (33); the upper surface of the machine body (1) is provided with a mounting opening (34) for placing the heat insulation cover (31); the heat insulation cover (31) is fixed to the inner wall of the mounting opening (34); the electromagnetic induction coil (32) is fixed to the inner wall of the heat insulation cover (31); and the heating crucible (33) is placed inside the electromagnetic induction coil (32).

7. A rheometer according to claim 6, characterized in that: A heater for operating the electromagnetic induction coil (32) is provided inside the machine body (1).

8. A rheometer according to claim 6, characterized in that: The electromagnetic induction coil (32) is fixed in a spiral shape on the inner wall of the heat insulation cover (31), and the height of the electromagnetic induction coil (32) is smaller than the height of the heating crucible (33).

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