Rheological testing device capable of being used for constant-pressure extrusion of high-viscosity materials

Abstract

The invention provides a rheological testing device capable of being used for constant-pressure extrusion of high-viscosity materials, which comprises a rack, the rack comprises a first partition plate, two weight clamping cylinders are mounted on the first partition plate, and weights are arranged between the two weight clamping cylinders on the first partition plate. The device further comprises a guide rod mechanism, the guide rod mechanism comprises two vertical guide rods, the tops of the vertical guide rods are connected with the bottom of a longitudinal connecting rod, and the bottom of the longitudinal connecting rod is connected with the top of a pressure guide connecting rod arranged between the two vertical guide rods. The bottoms of the vertical guide rods penetrate through the partition plate of the rack and are connected with the top of the weight loading rod. A pin mounting hole is formed in the weight loading rod, a weight clamping pin is mounted in the pin mounting hole, and the weight is jacked in through the weight clamping pin, so that the loading of pressure is realized. A pressure rod is arranged at the bottom of the pressure guide connecting rod; and a pressure head of the pressure rod applies constant pressure to the to-be-tested material. The constant-pressure extrusion device can be used for constant-pressure extrusion of high-viscosity flammable and explosive materials, gravity is converted into pressure, and it is guaranteed that the pressure is constant in the extrusion process.

Description

Technical Field

[0001] This invention belongs to the field of rheological measurement technology, and relates to constant pressure extrusion, specifically to a rheological testing device that can be used for constant pressure extrusion of high-viscosity materials. Background Technology

[0002] Melt extrusion flow characteristics are a core indicator determining the quality of injection molding and screw extrusion molding of polymer materials and composite materials. Accurate testing of these characteristics is crucial for process optimization, equipment design, and product performance optimization. In existing technologies, the melt in the extrusion molding process of high-performance thermoplastic composites exhibits high viscosity, poor flowability, and significant non-Newtonian fluid characteristics. Furthermore, it is easily affected by factors such as pressure fluctuations, temperature gradients, and flow structures, resulting in complex flow behavior that poses a significant challenge to testing techniques.

[0003] Existing testing devices and technologies are mostly based on traditional capillary rheometers, which have limitations such as the limited measurable melt viscosity and insufficient precision in constant pressure control. They struggle to simulate the constant pressure extrusion conditions in actual production processes, leading to discrepancies between test analysis results and practical applications. Furthermore, existing capillary rheometers are limited to testing the rheological properties of plastics or rubbers. For safety reasons, they cannot be used for testing high-viscosity, flammable materials, such as screw-molded double-base propellants. These materials have high formulation viscosity and cannot achieve a stable flow state in rotary viscometers, making it impossible for capillary rheometers to obtain reliable experimental data. While dual-barrel capillary rheometers have been developed in recent years, capable of testing the extrusion rheological properties of high-viscosity melts, they struggle to maintain constant pressure during extrusion. Therefore, there is an urgent need to develop testing devices and methods suitable for testing the constant pressure extrusion flow characteristics of high-viscosity melts. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a rheological testing device capable of constant-pressure extrusion of high-viscosity materials, thereby solving the technical problem that the constant-pressure control accuracy of existing rheological property testing devices for high-viscosity flammable fuels needs further improvement.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] A rheological testing device for constant pressure extrusion of high-viscosity materials includes a frame with multiple partitions arranged vertically. The frame includes a first partition, on which two weight-clamping cylinders are installed horizontally. Multiple weights are also arranged on the first partition, positioned in the middle of the horizontal direction between the two weight-clamping cylinders. The two weight-clamping cylinders enable the vertical clamping and lowering of the multiple weights.

[0007] It also includes a guide rod mechanism, which includes two vertical guide rods arranged longitudinally. The vertical top of the two vertical guide rods is connected to the vertical bottom of a longitudinal connecting rod arranged longitudinally. The vertical bottom of the longitudinal connecting rod is also connected to the vertical top of a pressure-guiding connecting rod arranged vertically along the central axis. The pressure-guiding connecting rod is arranged in the longitudinal middle of the two vertical guide rods.

[0008] The vertical bottoms of both vertical guide rods pass through the partition of the frame, and are connected to the vertical tops of the weight loading rods arranged vertically. Each weight loading rod corresponds to one of the vertical guide rods. The weight loading rods also have multiple longitudinally penetrating pin mounting holes, evenly distributed vertically. Weights can be installed in these holes to clamp the pins. By using weights in two adjacent pin mounting holes on the same horizontal line to clamp the pins and push them to the front and rear sides of the weight, the required pressure is applied.

[0009] The axial length of the pressure guiding connecting rod is less than the axial length of the vertical guide rod. A pressure rod can also be detachably installed at the vertical bottom of the pressure guiding connecting rod. The pressure head at the vertically downward end of the pressure rod applies a constant pressure to the material to be tested.

[0010] The present invention also has the following technical features.

[0011] Specifically, the frame also includes a third partition plate, which is arranged vertically above the first partition plate. An oil bath heating sleeve is also arranged on the third partition plate. An axially through heating sleeve mounting cavity is opened in the oil bath heating sleeve. A material cylinder and a die are coaxially installed vertically from top to bottom in the heating sleeve mounting cavity. The lower vertical end of the material cylinder is connected to the upper vertical end of the die.

[0012] The third partition plate is also provided with a vertically penetrating discharge port. The discharge port is coaxially arranged with the die. The inner diameter of the discharge port is larger than the minimum inner diameter of the die and smaller than the outer diameter of the oil bath heating jacket. By using the weight of the weight, the pressure head squeezes the material to be tested in the barrel, thereby realizing the extrusion of the material to be tested from the vertical downward end of the die.

[0013] Specifically, the frame also includes a second partition, which is arranged vertically between the first and third partitions. An electronic scale is also arranged on the second partition, with the weighing pan of the electronic scale arranged vertically below the discharge port of the third partition.

[0014] Specifically, vertical through-hole pins are respectively opened at the center of the front and rear ends of the weight.

[0015] The frame can also be detachably equipped with a top locking cylinder. Driven by the top locking cylinder, the weight clamping pin is pushed into the pin slot of the weight, and the weight is clamped when the two weight clamping cylinders are depressurized.

[0016] Specifically, the weight is also provided with an axially penetrating weight positioning hole.

[0017] The first partition is also equipped with a weight positioning post, which is positioned in the middle of the two weight clamping cylinders. The weight positioning post passes through the weight positioning holes of multiple weights from bottom to top, so that the central axes of the multiple weights are collinear.

[0018] Specifically, the frame also includes a fourth partition, which is arranged vertically above the third partition. The fourth partition has three vertical through holes, which correspond to two vertical guide rods and a pressure-guiding connecting rod. Each fourth partition through hole is also equipped with a first sliding bearing. The upper ends of the two vertical guide rods and the upper ends of the pressure-guiding connecting rod are slidably mounted on the fourth partition through the first sliding bearing.

[0019] Specifically, the third partition plate is also provided with a vertical through hole, which corresponds one-to-one with the vertical guide rod. The inner diameter of the third partition plate through hole is larger than the outer diameter of the vertical guide rod, and the lower end of the vertical guide rod passes through the third partition plate through hole from top to bottom.

[0020] The second partition plate is also provided with vertical through holes, which correspond one-to-one with the vertical guide rods. Each second partition plate through hole is also equipped with a second sliding bearing. The two vertical guide rods are slidably mounted on the second partition plate near their lower ends via the second sliding bearings.

[0021] Specifically, a heating oil tank is also provided on the second partition plate. The heating oil tank and the oil bath heating jacket are sealed and connected through the first pipe to form a heating circuit.

[0022] The third partition is also equipped with a cooling oil tank, which is also sealed and connected to the oil bath heating jacket through a second pipe to form a cooling circuit.

[0023] Compared with the prior art, the present invention has the following technical effects.

[0024] (I) The device in this invention can be used for constant pressure extrusion of high-viscosity flammable and explosive materials. The weight is connected to the pressure head through a weight loading rod, a vertical guide rod, a pressure guiding connecting rod, and a pressure rod, converting its own weight into pressure, which can ensure that the pressure is constant during the extrusion process. By selecting the weight and the die, the mass flow rate of high-viscosity melts from 0.1 MPa·s to 20 MPa·s can be measured.

[0025] (II) The device in this invention provides a mechanical framework for the later adoption of remote control, which can reduce the direct contact between operators and flammable and explosive test materials, and further reduce safety hazards.

[0026] (III) The device in this invention can maintain constant pressure and temperature throughout the extrusion process of the material to be tested, and realize the test of the flow characteristics of high viscosity melt under forced extrusion. It provides a test device and method for the extrudability and extrusion flow characteristics of flammable and explosive materials to be tested, and has good application prospects in the field of high viscosity material processing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the device in this invention.

[0028] Figure 2 This is a top view of the weight structure in this invention.

[0029] The meanings of the labels in the diagram are as follows: 1-Frame, 2-Weight clamping cylinder, 3-Weight, 4-Guide rod mechanism, 5-Weight loading rod, 6-Pin mounting hole, 7-Oil bath heating jacket, 8-Cylinder, 9-Electronic scale, 10-Top locking cylinder, 11-Weight positioning column, 12-First sliding bearing, 13-Second sliding bearing, 14-Heating oil tank, 15-Cooling oil tank, 16-Explosion-proof junction box.

[0030] 101 - First partition, 102 - Second partition, 103 - Third partition, 104 - Fourth partition, 105 - Perforation in the fourth partition, 106 - Perforation in the third partition, 107 - Perforation in the second partition.

[0031] 301 - Pin slot hole, 302 - Weight positioning hole.

[0032] 401-Vertical guide rod, 402-Longitudinal connecting rod, 403-Pressure guiding connecting rod, 404-Pressure rod, 405-Pressure head.

[0033] The specific content of the present invention will be further described in detail below with reference to the embodiments. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, all the equipment, components and materials in this invention are commonly used in the art in the prior art. For example, the electronic scale is a known electronic scale, the top locking cylinder is a known top locking cylinder, the die is a known die, the latch is a known latch, the material cup is a known material cup, and the elastic gasket is a known elastic gasket.

[0035] In this invention, the OXYZ coordinate system is a three-dimensional rectangular coordinate system, with the X-axis pointing horizontally to the right; the Y-axis pointing vertically forward; and the Z-axis pointing vertically upward.

[0036] In this embodiment, high viscosity material refers to material with a viscosity of 0.1 MPa·s to 20 MPa·s.

[0037] Following the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of the present invention fall within the protection scope of the present invention.

[0038] Example: This embodiment provides a rheological testing device capable of being used for constant-pressure extrusion of high-viscosity materials, such as... Figure 1 As shown, the machine includes a frame 1 with multiple partitions arranged vertically. The frame 1 includes a first partition 101. Two weight clamping cylinders 2 are installed horizontally on the first partition 101. Multiple weights 3 are also arranged on the first partition 101. The multiple weights 3 are arranged in the middle of the horizontal direction of the two weight clamping cylinders 2. The multiple weights 3 are clamped and lowered vertically by the two weight clamping cylinders 2.

[0039] It also includes a guide rod mechanism 4, which includes two vertical guide rods 401 arranged longitudinally. The vertical top of the two vertical guide rods 401 is connected to the vertical bottom of a longitudinal connecting rod 402 arranged longitudinally. The vertical bottom of the longitudinal connecting rod 402 is also connected to the vertical top of a pressure guiding connecting rod 403 arranged vertically along the central axis. The pressure guiding connecting rod 403 is arranged in the longitudinal middle of the two vertical guide rods 401.

[0040] The vertical bottoms of both vertical guide rods 401 pass through the partition of the frame 1. The vertical bottoms of the vertical guide rods 401 are also connected to the vertical tops of the weight loading rods 5 arranged vertically. The weight loading rods 5 correspond one-to-one with the vertical guide rods 401. The weight loading rods 5 are also provided with multiple longitudinally penetrating pin mounting holes 6. The multiple pin mounting holes 6 are evenly arranged vertically. Weights can be installed in the pin mounting holes 6 to clamp the pins. By using the weights in the two pin mounting holes 6 on the same horizontal line to clamp the pins to the front and rear sides of the weight 3, the required pressure can be applied.

[0041] The axial length of the pressure guiding connecting rod 403 is less than the axial length of the vertical guide rod 401. The vertical bottom of the pressure guiding connecting rod 403 can also be detachably installed with a pressure rod 404. The pressure head 405 at the vertical lower end of the pressure rod 404 applies a constant pressure to the material to be tested.

[0042] In this embodiment, when the two weights clamp the cylinder 2 under load, the pressure head 405 at the vertically downward end of the pressure rod 404 is located vertically above the oil bath heating jacket 7.

[0043] In this embodiment, the two vertical guide rods 401 have the same structure and size.

[0044] In this embodiment, multiple weights 3 are connected to a pressure head 405 via two weight loading rods 5, two vertical guide rods 401, a pressure guiding connecting rod 403, and a pressure rod 404, converting their own weight into pressure.

[0045] In this embodiment, the weight clamping pin is a commonly known pin in the art, and the material to be tested is a commonly known material to be tested in the art.

[0046] As a preferred embodiment, the frame 1 further includes a third partition 103, which is arranged vertically above the first partition 101. An oil bath heating sleeve 7 is also arranged on the third partition 103. An axially penetrating heating sleeve mounting cavity is opened in the oil bath heating sleeve 7. A material cylinder 8 and a die are coaxially installed in the heating sleeve mounting cavity from top to bottom vertically. The lower vertical end of the material cylinder 8 is connected to the upper vertical end of the die.

[0047] The third partition 103 is also provided with a vertically penetrating discharge port. The discharge port is coaxially arranged with the die. The inner diameter of the discharge port is larger than the minimum inner diameter of the die and smaller than the outer diameter of the oil bath heating jacket 7. By using the weight 3, the pressure head 405 squeezes the material to be tested in the barrel 8, thereby realizing the extrusion of the material to be tested from the vertical downward end of the die.

[0048] In this embodiment, the cross-sectional shape of the oil bath heating jacket 7 is annular.

[0049] In this embodiment, the pressure head 405 loads the material to be tested in the barrel 8, causing the melt of the material to be tested to be extruded from the die at the lower end of the barrel 8.

[0050] As a preferred embodiment, the frame 1 further includes a second partition 102, which is arranged vertically between the first partition 101 and the third partition 103. An electronic scale 9 is also arranged on the second partition 102, and the weighing pan of the electronic scale 9 is arranged vertically below the discharge port of the third partition 103.

[0051] In this embodiment, a cutting machine is provided below the third partition 103, and a chute is also installed on the lower surface of the third partition 103. The material inlet of the chute is coaxially arranged with the material outlet on the third partition 103. The blades of the cutting machine are arranged between the material outlet on the third partition 103 and the vertical direction of the chute, so that the material to be tested extruded from the die is cut into sections by the blades of the cutting machine and smoothly transferred to the weighing pan of the electronic scale 9 through the chute. The function of the chute is to ensure that the material to be tested falls onto the weighing pan of the electronic scale 9. Cutting is to cut the material to be tested extruded from the die within a specified time period, measure the mass, and obtain the mass flow rate. At the same time, cutting can further ensure that the extruded material to be tested falls onto the weighing pan of the electronic scale 9. The chute adopts a bucket-shaped chute commonly known in the art. The cutting machine adopts a cutting machine commonly known in the art.

[0052] As a preferred embodiment of this invention, such as Figure 2 As shown, vertical through pin slots 301 are respectively opened at the center of the front and rear ends of the weight 3.

[0053] A top-locking cylinder 10 can also be detachably installed on the frame 1. Driven by the top-locking cylinder 10, the weight clamping pin is pushed into the pin slot 301 of the weight 3, thereby clamping the weight 3 when the two weight clamping cylinders 2 are depressurized.

[0054] In this embodiment, there are two top locking cylinders 10, and each top locking cylinder 10 corresponds to a weight clamping pin when the material to be tested is extruded.

[0055] As a preferred embodiment, the weight 3 is also provided with an axially penetrating weight positioning hole 302.

[0056] The first partition 101 is also equipped with a weight positioning post 11. The weight positioning post 11 is arranged in the middle of the two weight clamping cylinders 2. The weight positioning post 11 passes through the weight positioning holes 302 of multiple weights 3 from bottom to top, so that the central axes of multiple weights 3 are collinear.

[0057] As a preferred embodiment, the frame 1 further includes a fourth partition 104, which is arranged vertically above the third partition 103. The fourth partition 104 has three vertically penetrating fourth partition holes 105, which correspond to the two vertical guide rods 401 and the pressure guiding connecting rod 403. Each fourth partition hole 105 is also equipped with a first sliding bearing 12. The upper ends of the two vertical guide rods 401 and the upper ends of the pressure guiding connecting rod 403 are slidably mounted on the fourth partition 104 through the first sliding bearing 12.

[0058] As a preferred embodiment, the third partition 103 is also provided with a vertically penetrating third partition through hole 106, which corresponds one-to-one with the vertical guide rod 401. The inner diameter of the third partition through hole 106 is larger than the outer diameter of the vertical guide rod 401, and the lower end of the vertical guide rod 401 passes through the third partition through hole 106 from top to bottom.

[0059] The second partition 102 is also provided with a vertical through hole 107. The second partition through hole 107 corresponds one-to-one with the vertical guide rod 401. A second sliding bearing 13 is installed in each second partition through hole 107. The two vertical guide rods 401 are slidably mounted on the second partition 102 near their lower ends through the second sliding bearing 13.

[0060] As a preferred embodiment, a heating oil tank 14 is also provided on the second partition 102. The heating oil tank 14 and the oil bath heating jacket 7 are sealed and connected through the first pipe to form a heating circuit.

[0061] The third partition 103 is also equipped with a cooling oil tank 15, which is also sealed and connected to the oil bath heating jacket 7 through a second pipe to form a cooling circuit.

[0062] In this embodiment, the heating oil tank 14 controls the temperature of the medium inside the oil bath heating jacket 7 to heat the material to be tested in the barrel 8 and the die. More preferably, the heating time of the oil bath heating jacket 7 is controlled within 15 minutes. The cooling oil tank 15 cools the medium after the oil bath heating jacket 7 has been used. Both the first and second pipes use pipes commonly known in the art.

[0063] In this embodiment, if the number of weights 3 corresponding to the required pressure is 2, when the weight clamping pins are installed or function on the weights 3, the two symmetrically arranged weight clamping pins are installed on the front and back sides of the second weight 3 from top to bottom.

[0064] As a further solution to the device in this embodiment, an explosion-proof junction box 16 is also provided on the first partition 101. The explosion-proof junction box 16 is located on the right side of the two weight clamping cylinders 2. The explosion-proof junction box 16 has a built-in PLC controller and circuit to realize the automatic control of the entire device. The explosion-proof junction box 16 adopts the commonly known explosion-proof junction box in the art, and the PLC controller and control method adopt the commonly known PLC controller and control method in the art.

[0065] In this embodiment, the material to be tested is manually added to the barrel 8 and then pressed by the pressure head 405. The heating circuit is turned on to heat the material to be tested. When the temperature reaches the set value, pre-pressing is performed first to expel the air in the gap between the material to be tested in the barrel 8. Then, during the extrusion process, the gravity of the weight 3 is transmitted to the pressure head 405 through the vertical guide rod 401 to extrude the material to be tested under constant pressure. The electronic scale 9 measures the mass to obtain the mass flow rate of the melt.

[0066] When the device in this embodiment is used subsequently, the following steps are specifically included: Step 1, Experiment Preparation: Turn on the power and air supply, and supply compressed air. Open the two weight clamping cylinders 2 to push all the weights 3 to the top. Assemble the guide rod mechanism 4. Select the die and install it from the bottom of the barrel 8. Lock the die with the latch. According to the experimental setup, install one set of weight clamping pins on the weights 3 corresponding to the pre-compression weight, and at the same time, pre-install another set of weight clamping pins on the weights 3 corresponding to the extrusion weight. Install the top locking cylinder 10 next to the pre-installed weight clamping pins during extrusion. Turn on the heating oil tank 14 and cooling oil tank 15, i.e., oil bath circulation, set the experimental temperature, start heating to the set temperature and wait for the temperature to stabilize; install the chute; prepare the weighed material to be tested in the material cup according to the experimental preset, and then add it to the material cylinder 8; install the elastic pad below the pressure head 405 into the material cylinder 8 and place it on the material to be tested; prepare the electronic scale 9 with the weighing pan and place it below the die.

[0067] Step 2, Extrusion Test: Set the pre-compression time, the initial cutting start time, the cutting time interval, and the number of cutting operations; start the constant pressure experiment, and the experiment proceeds automatically. First, the two weight clamping cylinders 2 depress, entering the pre-compression state. After the pre-compression is completed, the two weight clamping cylinders 2 lift all the weights 3 again. Then, the top locking cylinder 10 clamps the corresponding weights during extrusion and pushes them into the weights 3. The two weight clamping cylinders 2 depress again, entering the extrusion state. The cutting cylinder starts, and the cutting and weighing are repeated multiple times. The data is transmitted to the background and the experimental data is calculated. After a single test, the two weight clamping cylinders 2 lift all the weights, and the two top locking cylinders 10 depress and reset. The material to be tested is manually removed from the weighing pan of the electronic scale 9.

[0068] Step 3, Completion and Cleanup: After all tests are completed, remove the guide rod mechanism 4 and clean the residual material adhering to the pressure rod 404; remove the locking buckle of the die and the die; clean the die and the material cylinder 8; turn off the heating and manually switch the heating circuit to the cooling circuit to cool the medium; remove the weight clamping pins on both sides of the weight 3 and unload the weight 3; reset the cylinder 2 with the two weights, turn off the power and air supply and put the die away, and the test is over.

Claims

1. A rheological testing device capable of constant pressure extrusion of high-viscosity materials, comprising a frame (1) with multiple partitions arranged vertically, wherein the frame (1) includes a first partition (101), characterized in that, Two weight-clamping cylinders (2) are installed horizontally on the first partition (101). Multiple weights (3) are also arranged on the first partition (101). The multiple weights (3) are arranged in the middle of the horizontal direction of the two weight-clamping cylinders (2). The multiple weights (3) can be clamped and lowered vertically by the two weight-clamping cylinders (2). It also includes a guide rod mechanism (4), which includes two vertical guide rods (401) arranged along the longitudinal direction. The vertical top of the two vertical guide rods (401) is connected to the vertical bottom of the longitudinal connecting rod (402) arranged along the longitudinal direction. The vertical bottom of the longitudinal connecting rod (402) is also connected to the vertical top of the pressure guiding connecting rod (403) arranged along the central axis in the vertical direction. The pressure guiding connecting rod (403) is arranged in the middle of the longitudinal direction of the two vertical guide rods (401). The vertical bottom of the two vertical guide rods (401) passes through the partition of the frame (1). The vertical bottom of the vertical guide rod (401) is also connected to the vertical top of the weight loading rod (5) arranged vertically. The weight loading rod (5) corresponds one-to-one with the vertical guide rod (401). The weight loading rod (5) is also provided with multiple longitudinally penetrating pin mounting holes (6). The multiple pin mounting holes (6) are evenly arranged vertically. Weights can be installed in the pin mounting holes (6) to clamp the pins. The weights clamp the pins in the two pin mounting holes (6) on the same horizontal line to the front and rear sides of the weight (3) to achieve the loading of the required pressure. The axial length of the pressure guiding connecting rod (403) is less than the axial length of the vertical guide rod (401). The vertical bottom of the pressure guiding connecting rod (403) can also be detachably installed with a pressure rod (404). The pressure head (405) at the vertical lower end of the pressure rod (404) applies a constant pressure to the material to be tested.

2. The rheological testing device as described in claim 1, capable of being used for constant pressure extrusion of high-viscosity materials, characterized in that, The frame (1) also includes a third partition (103), which is arranged vertically above the first partition (101). An oil bath heating sleeve (7) is also arranged on the third partition (103). An axially penetrating heating sleeve mounting cavity is opened in the oil bath heating sleeve (7). A material cylinder (8) and a die are coaxially installed in the heating sleeve mounting cavity from top to bottom vertically. The lower vertical end of the material cylinder (8) is connected to the upper vertical end of the die. The third partition (103) is also provided with a vertically penetrating discharge port. The discharge port is coaxially arranged with the die. The inner diameter of the discharge port is greater than the minimum inner diameter of the die and less than the outer diameter of the oil bath heating jacket (7). By using the weight (3), the pressure head (405) squeezes the material to be tested in the cylinder (8), thereby realizing the extrusion of the material to be tested from the vertical lower end of the die.

3. The rheological testing device as described in claim 2, capable of being used for constant pressure extrusion of high-viscosity materials, is characterized in that... The frame (1) also includes a second partition (102), which is arranged vertically between the first partition (101) and the third partition (103). An electronic scale (9) is also arranged on the second partition (102), and the weighing pan of the electronic scale (9) is arranged vertically below the discharge port of the third partition (103).

4. The rheological testing device as described in claim 2, capable of being used for constant pressure extrusion of high-viscosity materials, characterized in that, The weight (3) has vertically penetrating pin slots (301) at the center of its front and rear ends. The frame (1) can also be detachably installed with a top locking cylinder (10). Driven by the top locking cylinder (10), the weight clamping pin is pushed into the pin slot (301) of the weight (3), and the weight (3) is clamped when the two weight clamping cylinders (2) are depressurized.

5. The rheological testing device as described in claim 2, capable of being used for constant pressure extrusion of high-viscosity materials, characterized in that, The weight (3) is also coaxially provided with an axially penetrating weight positioning hole (302). The first partition (101) is also equipped with a weight positioning column (11). The weight positioning column (11) is arranged in the middle of the two weight clamping cylinders (2) in the transverse direction. The weight positioning column (11) passes through the weight positioning holes (302) of multiple weights (3) from bottom to top, so that the central axes of multiple weights (3) are collinear.

6. The rheological testing device as described in claim 2, capable of being used for constant pressure extrusion of high-viscosity materials, characterized in that, The frame (1) also includes a fourth partition (104), which is arranged vertically above the third partition (103). The fourth partition (104) has three vertically penetrating fourth partition holes (105), which correspond to two vertical guide rods (401) and pressure guiding connecting rods (403). Each fourth partition hole (105) is also equipped with a first sliding bearing (12). The two vertical guide rods (401) and the pressure guiding connecting rod (403) near the upper end are slidably mounted on the fourth partition (104) through the first sliding bearing (12).

7. The rheological testing device as described in claim 2, capable of being used for constant pressure extrusion of high-viscosity materials, characterized in that, The third partition (103) is also provided with a vertical through hole (106), which corresponds to the vertical guide rod (401) one by one. The inner diameter of the third partition through hole (106) is larger than the outer diameter of the vertical guide rod (401), and the lower end of the vertical guide rod (401) passes through the third partition through hole (106) from top to bottom. The second partition (102) is also provided with a vertical through hole (107), which corresponds to the vertical guide rod (401) one by one. A second sliding bearing (13) is installed in each second partition hole (107). The two vertical guide rods (401) are slidably mounted on the second partition (102) near their lower ends through the second sliding bearing (13).

8. The rheological testing device as described in claim 2, capable of being used for constant pressure extrusion of high-viscosity materials, characterized in that, The second partition (102) is also provided with a heating oil tank (14), which is sealed and connected to the oil bath heating jacket (7) through the first pipe to form a heating circuit; The third partition (103) is also provided with a cooling oil tank (15), which is also sealed and connected to the oil bath heating jacket (7) through a second pipe to form a cooling circuit.

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