A micro-pressing test machine

Abstract

The present invention provides a micro-squeezing test machine, comprising a base, a lower-roll pressure adjustment and lifting unit mounted on the base, a lower-roll oil pressure supply and pressure adjustment unit, and an upper-roll speed adjustment and rotation unit. The lower-roll pressure adjustment and lifting unit comprises a pressure adjustment jack, a lifting platform connected to the pressure adjustment jack, and a lower-roll mounted on the lifting platform, wherein the lifting platform has an adjustable inclination angle. The lower-roll oil pressure supply and pressure adjustment unit is connected to the lower-roll for supplying oil to the lower-roll and adjusting the oil pressure. The upper-roll speed adjustment and rotation unit comprises an upper-roll, an upper-roll motor, and a frequency conversion control cabinet. The upper-roll is located above the lower-roll and is connected to the upper-roll motor. The frequency conversion control cabinet is electrically connected to the upper-roll motor. The present invention is capable of completing squeezing experiments at different line pressures and speeds.

Description

Technical Field

[0001] The invention relates to experimental instrument equipment used for squeezing and dehydrating wet paper sheets in the pulping and papermaking industry, and in particular to a micro-squeezing experimental machine. Background Art

[0002] In the papermaking process, the dewatering performance of the press section directly impacts the speed of the paper machine and the steam energy consumption of the dryer section. Generally speaking, for every 1% increase in wet paper dewatering in the press section, steam consumption in the dryer section is reduced by approximately 5%. Therefore, to increase paper machine speed and save steam, papermakers employ various pressing technologies to maximize dewatering efficiency and improve the dryness of wet paper exiting the press. Currently, two-roll presses and multi-roll compound presses are the primary technologies used. Traditional two-roll presses include flat roll presses, vacuum presses, blind hole presses, groove presses, wire presses, and liner presses, as well as pulse presses and hot presses. Multi-roll compound presses include three-roll two-nip, four-roll three-nip, and five-roll three-nip compound presses. All of these pressing technologies are designed to achieve optimal dewatering performance. With the emergence of new pressing technologies such as double-roll wide nip pressing, standard shoe press and micro shoe press, the pressing efficiency and paper machine speed have been greatly improved.

[0003] With the development of larger and faster paper machines, the press section of paper machines has become increasingly larger, making press roll dewatering tests increasingly difficult and expensive. Press impulse theory provides a theoretical basis for laboratory research on various new presses and a reference for the design of press sections on large, high-speed paper machines. Therefore, it is of great significance to invent an experimental instrument based on press impulse theory for wet paper sheet dewatering in the pulp and paper industry, namely a micro-press test machine.

[0004] CN105189864A discloses a shoe-type pressing device that uses a hydraulic cylinder and connecting rod assembly to drive a slider to transmit pressure to a shoe sleeve, which is then pushed against a load-bearing component to limit the line pressure. Standard shoe presses have large roller diameters and masses, occupying a large area and making them inconvenient for laboratory research. Existing shoe presses have certain drawbacks during use, including inconvenient assembly and disassembly. To meet a wider range of usage requirements, further improvements are needed. To this end, we propose a micro-pressing test machine. Summary of the Invention

[0005] In order to overcome the problem that the pressing section of large-scale high-speed paper machines is huge and the pressing and dehydration tests are difficult, and to provide a reference basis for the design of the pressing section of large-scale high-speed paper machines, the present invention provides an experimental instrument and equipment for pressing and dehydrating wet paper sheets in the pulping and papermaking industry, namely a micro-pressing test machine, which can simulate the experimental research on pressing and dehydration of wet paper sheets in the press section of a paper machine.

[0006] In order to achieve the purpose of the present invention, the present invention provides a micro-pressing test machine, which includes a base and a pressing lower roller pressure adjustment and lifting unit, a lower roller oil pressure supply and pressure adjustment unit, and a pressing upper roller speed regulation and rotation unit arranged on the base. The three functional structural units are all installed on the base plate to form a structural whole.

[0007] The pressure regulating and lifting unit of the lower pressing roller includes a pressure regulating jack, a lifting platform connected to the pressure regulating jack, and the lower pressing roller arranged on the lifting platform, and the inclination angle of the lifting platform is adjustable;

[0008] The lower roller oil pressure supply and pressure regulating unit is connected to the lower pressing roller and is used to supply oil to the lower pressing roller and regulate the oil pressure;

[0009] The squeezing upper roller speed regulating rotation unit includes a squeezing upper roller, a squeezing upper roller motor and a frequency conversion control cabinet. The squeezing upper roller is located above the squeezing lower roller, and the squeezing upper roller is connected to the squeezing upper roller motor. The frequency conversion control cabinet is electrically connected to the squeezing upper roller motor.

[0010] Furthermore, the pressure regulating jack includes a handle lifting and pressure regulating rocker, a lifting piston rod, an oil pressure indicator and a pressure relief valve. The handle lifting and pressure regulating rocker is used to adjust the lifting and lowering of the lifting piston rod. The lifting platform is connected to the lifting piston rod. The oil pressure indicator is used to display the pressure of the pressure regulating jack in real time.

[0011] Furthermore, the pressure regulating range of the pressure regulating jack is from 0 to 5.0 MPa, which can meet the pressure regulation of different pressing types.

[0012] Furthermore, the lifting platform includes an upper plate, a lower plate, connecting posts, and nuts. The upper and lower plates are positioned opposite each other and connected by the connecting posts and nuts. The connecting posts are studs, and the upper and lower plates are fixedly connected by the studs and nuts. Adjusting the position of the nuts on the studs adjusts the inclination angle between the lifting platform and the lower press roll, making the experimental conditions more consistent with the shoe press conditions of large-scale high-speed paper machines.

[0013] Furthermore, the lower roller oil pressure supply and pressure regulation unit includes a hydraulic oil supply station, an oil pressure indicator and an oil pipeline. The hydraulic oil supply station is connected to the pressing lower roller through the oil pipeline. The oil pressure indicator is used to display the pressure of the pressing lower roller.

[0014] Furthermore, the hydraulic oil supply station includes an oil pump motor, an oil pump, an oil pressure regulating valve, an electromagnetic directional valve, a pressure maintaining valve and an oil tank. The oil pump is connected to the output end of the oil pump motor, the oil pump is connected to the oil tank pipeline, the oil pump is connected to the lower pressing roller through the oil pipeline, and the oil pressure regulating valve, electromagnetic directional valve and pressure maintaining valve are arranged on the oil pipeline.

[0015] Furthermore, the oil pump 18 is a medium- and high-pressure gear oil pump, which can adjust the oil supply pressure in the shoe sleeve when the lower pressing roller 10 is a shoe pressing roller within the range of 0 to 5.0 MPa through the oil pressure regulating valve, and make the reading of the second oil pressure indicator gauge consistent with the reading of the first oil pressure indicator gauge of the pressure jack 3.

[0016] Furthermore, the squeezing upper roller speed regulating rotation unit further includes a diaphragm elastic coupling, and the squeezing upper roller and the squeezing upper roller motor are connected via the diaphragm elastic coupling.

[0017] Furthermore, the squeezing upper roller speed regulating rotation unit also includes an intermediate support plate, which is fixed to the base via a connecting column, and the squeezing upper roller motor is fixed to the intermediate support plate.

[0018] Furthermore, a power detection monitor of the upper roller motor of the press is provided in the frequency conversion control cabinet, which is used to detect the power of the upper roller motor of the press in real time and adjust the speed and the linear pressure of the press.

[0019] Furthermore, the pressing lower roller is a miniature shoe pressure roller, including a roller shaft, a shoe sleeve pressure cover, a shoe plate tightening screw, a shoe pressure plate and an elastic boot sleeve. The roller shaft is hollow, the elastic boot sleeve is fixed on the roller shaft, the shoe pressure plate is located on the outside of the elastic boot sleeve and is fixed on the roller surface, and an oil filling hole communicating with the axis of the roller shaft is opened on the shoe pressure plate. The boot sleeve pressure cover is provided on both sides of the shoe pressure plate. The elastic boot sleeve, the shoe pressure plate and the roller shaft surface constitute a closed oil pressure space.

[0020] Furthermore, the lower pressing roll is replaced with another type of pressing roll to form a pressing pair of rolls together with the upper pressing roll.

[0021] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0022] (1) The functional modules of the present invention, such as the pressure regulating and lifting unit of the lower roller, the oil pressure supply and pressure regulating unit of the lower roller, and the speed regulating and rotating unit of the upper roller, can be detachably arranged on the base, and are very convenient to assemble and disassemble.

[0023] (2) When the micro-pressing test machine provided by the present invention is working, first close the pressure relief valve of the pressure regulating jack, adjust the handle to lift the pressure regulating rocker, so that the piston rod of the pressure regulating jack rises, driving the lifting platform and the bearing seat installed on the flat plate thereon and the pressing lower roller to rise until they are in slight contact with the felt, the wet paper sheets on the felt and the pressing upper roller. At this time, the reading of the oil pressure gauge is 0, start the pressing upper roller motor, adjust the frequency of the inverter according to the speed required by the experiment, and then adjust the handle to lift the pressure regulating rocker according to the pressure required by the experiment, observe the reading of the first oil pressure gauge to make it meet the experimental pressure, and at the same time start the hydraulic station oil pump motor, adjust the oil pressure regulating valve, observe the second oil pressure gauge to make it consistent with the reading of the first oil pressure gauge of the pressure regulating jack, and start the pressing and dehydration experiment. After completing a set of dehydration experiments under pressure and speed, open the pressure relief valve on the pressure regulating jack, lower the piston rod, lower the lifting platform and the lower pressing roller, and disengage them from the upper pressing roller. Turn off the upper pressing roller motor and the hydraulic station oil pump motor. Repeat the above steps for each set of data experiments to complete the pressing experiments under different line pressures and different speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a micro-squeezing test machine provided by an embodiment of the present invention.

[0025] Figure 2 The present invention provides a schematic diagram of a simple shoe press roller-pressing lower roller structure of a micro-pressing experimental machine.

[0026] Figure 3 It is a schematic diagram of the structure of a shoe pressure plate of a micro-pressing experimental machine provided by an embodiment of the present invention.

[0027] Figure 4 The present invention provides a schematic diagram of the principle of the oil pressure supply and pressure regulation unit for the lower roller of a micro-pressing experimental machine.

[0028] Figure 5 It is a structural schematic diagram of a hydraulic oil supply station provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1The present invention provides a micro-pressing test machine for papermaking wet paper sheet pressing and dehydration experiments, comprising a base 1 and a pressing lower roller pressure regulating and lifting unit, a lower roller oil pressure supply and pressure regulating unit, and a pressing upper roller speed regulating rotation unit detachably arranged on the base 1.

[0031] The pressure-adjusting and lifting unit for the lower pressing roller includes a pressure-adjusting jack 3, a lifting platform 6, a bearing seat 9, and a lower pressing roller 10. The pressure-adjusting jack 3 is bolted to the base 1. The lifting platform 6 is connected to the pressure-adjusting jack 3. The lower pressing roller 10 is disposed on the lifting platform 6. In one embodiment of the present invention, the lifting platform 6 is composed of an upper plate and a lower plate fixedly connected to each other via four studs and nuts to form a platform as a whole. By adjusting the position of the nuts on the studs, the inclination angle of the lifting platform 6 can be adjusted to ensure a consistent gap between the shoe pressure plate and the upper pressing roller 12, thereby ensuring uniform shoe-type dehydration. The upper plate of the lifting platform 6 is provided with a lower roller bearing seat end connector 8. The bearing seat 9 is bolted to the lower roller bearing seat end connector 8. The lower pressing roller 10 is disposed within the bearing seat 9. The lower pressing roller 10 can be linked with the lifting and tilting of the lifting platform 6.

[0032] In some embodiments of the present invention, the pressure-regulating jack 3 includes a handle-operated pressure-regulating rocker 4, a lifting piston rod, a first oil pressure indicator 5-1, and a pressure relief valve 2. The lifting piston rod is clearance-matched with the lower plate of the lifting platform 6, and the first oil pressure indicator 5-1 is used to display the pressure of the pressure-regulating jack 3 in real time.

[0033] The handle of the pressure-regulating jack 3 is adjusted to raise and lower the pressure-regulating rocker 4, and the lifting piston rod of the pressure-regulating jack 3 is lifted and lowered accordingly, driving the lifting platform 6 and the lower pressing roller 10 installed on the flat plate thereon to rise and fall. When the lower pressing roller 10 contacts the upper pressing roller 12, the pressure of the first oil pressure indicator 5-1 will display the contact pressure of the upper and lower pressing rollers. By lifting and lowering the pressure-regulating rocker 4 and the pressure relief valve 2 through the handle, the contact pressure of the upper and lower pressing rollers, that is, the linear pressure of the pressing, can be arbitrarily adjusted within the range of 0 to 5.0 MPa.

[0034] See also Figure 4 The lower roll oil pressure supply and regulation unit includes a hydraulic oil supply station, a second oil pressure indicator 5-2, and an oil pipeline. The hydraulic oil supply station is bolted to the base 1. The second oil pressure indicator 5-2 displays the pressure within the lower pressing roll 10. The lower roll oil pressure supply and regulation unit should be disabled during the corresponding pressing experiment.

[0035] The hydraulic oil supply station includes an oil pump motor 17, an oil pump 18, an oil tank 22, an oil pressure regulating valve 19, an electromagnetic directional valve 20, and a pressure maintaining valve 21, which constitute the oil pressure regulation and control circuit of the lower roll. The oil pump 18 is connected to the output end of the oil pump motor 17, and the oil pump 18 is connected to the oil tank 22 through a pipeline. The oil pump 18 is connected to the oil tank 22 through a pipeline. The oil pump 18 is connected to the lower press roll 10 through an oil pipeline, and the oil pressure regulating valve 19, the electromagnetic directional valve 20 and the pressure maintaining valve 21 are arranged on the oil pipeline. During operation, the oil pump motor 17 is turned on, the electromagnetic directional valve 20 is activated, the upper and lower press rolls are adjusted to a set distance, the electromagnetic directional valve 20 adjusts the gap between the upper and lower press rolls by changing the oil circuit control direction, and the appropriate line pressure of the press roll is set through the oil pressure regulating valve 19. The oil pump motor 17 is turned off, and the pressure maintaining valve 21 can ensure that the press roll operates well under a constant pressure ratio.

[0036] In some embodiments of the present invention, the oil pipeline is made of rubber.

[0037] In some embodiments of the present invention, the oil pump 18 is a medium- and high-pressure gear oil pump, which can adjust the oil supply pressure in the shoe sleeve when the lower pressing roller 10 is a shoe pressure roller within the range of 0 to 5.0 MPa through the oil pressure regulating valve 19, and make the reading of the second oil pressure indicator 5-2 consistent with the reading of the first oil pressure indicator 5-1 of the pressure regulating jack 3.

[0038] See also Figure 2 In some embodiments of the present invention, the lower pressing roller 10 is a miniature simple shoe press roller, comprising a roller shaft 24, a shoe cover 25, shoe plate tightening screws 26, a shoe pressure plate 27, and an elastic shoe cover 28. The roller shaft 24 of the lower pressing roller 10 is hollow, and the shoe pressure plate 27 is fixed to the roller surface with countersunk hexagon socket bolts. The shoe pressure plate 27 is drilled with oil holes connected to the center of the roller shaft 24. The elastic shoe cover 28 is fixed to the roller shaft 24 at both ends using bolts and the shoe cover 25. This creates a closed oil pressure space between the elastic shoe cover 28, the shoe pressure plate 27, and the roller shaft 24 surface. When the oil pump motor 17 is activated, the oil pump 18 supplies oil to the simple shoe press roller, i.e., the lower pressing roller 10, via the solenoid directional valve 20. The oil pressure within the simple shoe press roller, i.e., the lower pressing roller 10, is adjusted to match the pressure indicated on the lower roller's first oil pressure indicator 5-1 via the oil pressure regulating valve 19 and the pressure maintaining valve 21, maintaining a stable pressure.

[0039] The squeezing upper roller speed regulation rotation unit includes a squeezing upper roller 12, a diaphragm elastic coupling 13, a squeezing upper roller motor 14, and a frequency conversion control cabinet 23. The squeezing upper roller 12 is fixed to the intermediate support plate 7 via the bearing seat 11 and the support plate of the bearing seat 11 with studs and nuts. The squeezing upper roller motor 14 is fixed to the intermediate support plate 7 via the motor support plate 15 and studs and nuts. The squeezing upper roller 12 and the squeezing upper roller motor 14 are connected via the diaphragm elastic coupling 13. The intermediate support plate 7 is fixed to the base 1 by four studs and nuts. The frequency conversion control cabinet 23 is fixed to the base 1 by bolts. The frequency conversion speed regulation control cabinet 23 is equipped with a power detection monitor for the squeezing upper roller motor 14. According to the requirements of the speed and the linear pressure of the squeeze, the power of the squeezing upper roller motor 14 can be detected in real time during the experiment and the squeezing pressure and speed can be adjusted to prevent motor overload.

[0040] In some embodiments of the present invention, the pressure regulating jack, the hydraulic oil supply station and the frequency conversion control cabinet are all fixed to the base 1 with bolts so that the three functional module units become a whole.

[0041] When the micro-pressing test machine is working, first check the gap between the upper pressing roller 12 and the pressing lower roller 10, close the pressure relief valve 2 of the pressure regulating jack 3, adjust the handle to lift the pressure regulating rocker 4, so that the piston rod of the pressure regulating jack 3 rises, and drives the lifting platform 6 and the bearing seat 9 installed on the upper plate and the pressing lower roller 10 to rise until they are in slight contact with the felt, the wet paper sheets on the felt and the pressing upper roller 12. At this time, the reading of the oil pressure gauge 5-1 is 0, start the pressing upper roller motor 14 used to drive the pressing upper roller 12, adjust the frequency of the frequency conversion speed control cabinet 23 according to the speed required by the experiment, and then adjust the handle to lift the pressure regulating rocker 4 according to the pressure required by the experiment, observe the reading of the oil pressure gauge 5-1 to meet the experimental pressure, and at the same time start the oil pump motor 17 of the hydraulic station, adjust the oil pressure regulating valve 19, observe the oil pressure gauge 5-2 to make it consistent with the reading of the oil pressure gauge 5-1 of the pressure regulating jack, and then start the pressing and dehydration experiment. After completing a set of dehydration experiments under different pressures and speeds, the pressure relief valve 2 on the pressure regulating jack 3 is opened, the piston rod descends, the lifting platform 6 and the lower pressing roller 10 descend, and disengage from the upper pressing roller 12. The upper pressing roller motor 14 and the hydraulic station oil pump motor 17 are shut down. Repeating these steps for each set of data experiments allows for the completion of experiments under different linear pressures and speeds. Adjusting the height of the lifting platform 6, and thus the distance between the upper and lower pressing rollers, can adjust the linear pressure between the pressing rollers, or replacing a pair of pressing rollers of different specifications can allow for the completion of experiments under different operating conditions. By adjusting the height of the lifting platform or replacing the pressing roller pair, the speed and linear pressure during pressing can be varied, allowing for the completion of experiments under different operating conditions.

[0042] The micro-pressing test machine provided by the embodiment of the present invention is designed as an integral structure, with all components bolted to the base via bolts and a support base. The pressure-regulating jack and inverter control cabinet are bolted to the base, and the lower press roller is fixed to the upper plate of the lifting platform via two bearing seats. Hydraulic oil inlet and outlet devices are connected to both ends of the bearing seats. The lower plate of the lifting platform cooperates with the piston rod of the pressure-regulating jack, and the lower press roller, coupled to the lifting platform, rises and falls as the pressure-regulating jack rises and falls. The inclination of the lifting platform can be adjusted to adjust the inclination angle of the lower press roller. The upper press roller is fixed to the upper support plate via the upper press roller bearing seat. The upper press roller is connected to the upper press roller motor via an elastic diaphragm coupling. The upper press roller motor and the motor support plate are also fixed to the middle support plate via studs and nuts. The middle support plate is fixed to the base via four large support studs and nuts. The present invention can realize various types of paper sheet pressing and dehydration experiments at different speeds, different line pressures and different inclination angles by adjusting the motor speed through frequency conversion, adjusting the handle rocker of the jack and the inclination angle of the lifting platform or replacing different pressing roller pairs.

[0043] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A micro-squeezing test machine, characterized in that: It comprises a base (1) and a pressing lower roller pressure regulating and lifting unit, a lower roller oil pressure supply and pressure regulating unit and a pressing upper roller speed regulating rotation unit detachably arranged on the base (1). The squeezing lower roller pressure regulating and lifting unit comprises a pressure regulating jack (3), a lifting platform (6) connected to the pressure regulating jack (3), and a squeezing lower roller (10) arranged on the lifting platform (6), and the inclination angle of the lifting platform (6) is adjustable; The lower roller oil pressure supply and pressure regulating unit is connected to the pressing lower roller (10) and is used to supply oil to the pressing lower roller (10) and regulate the oil pressure; The squeezing upper roller speed regulating rotation unit comprises a squeezing upper roller (12), a squeezing upper roller motor (14) and a frequency conversion control cabinet (23), wherein the squeezing upper roller (12) is located above the squeezing lower roller (10), and the squeezing upper roller (12) is connected to the squeezing upper roller motor (14), and the frequency conversion control cabinet (23) is electrically connected to the squeezing upper roller motor (14); the pressure regulating jack (3) comprises a handle lifting pressure regulating rocker (4), a lifting piston rod, an oil pressure indicator (5-1) and a pressure relief valve (2), wherein the handle lifting pressure regulating rocker (4) is used to adjust the lifting of the lifting piston rod, the lifting platform (6) is connected to the lifting piston rod, and the oil pressure indicator (5-1) is used to display the pressure of the pressure regulating jack (3) in real time; the oil pressure supply and regulating of the lower roller are connected The pressure unit includes a hydraulic oil supply station, an oil pressure indicator (5-2) and an oil pipeline. The hydraulic oil supply station is connected to the pressing lower roller (10) through the oil pipeline. The oil pressure indicator (5-2) is used to display the pressure of the pressing lower roller (10). The hydraulic oil supply station includes an oil pump motor (17), an oil pump (18), an oil pressure regulating valve (19), an electromagnetic directional valve (20), a pressure maintaining valve (21) and an oil tank (22). The oil pump (18) is connected to the output end of the oil pump motor (17). The oil pump (18) is connected to the oil tank (22) through a pipeline. The oil pump (18) is connected to the pressing lower roller (10) through the oil pipeline. The oil pressure regulating valve (19), the electromagnetic directional valve (20) and the pressure maintaining valve (21) are arranged on the oil pipeline.

2. A micro-squeezing test machine according to claim 1, characterized in that: The lifting platform (6) comprises an upper plate, a lower plate, a connecting column and a nut. The upper plate and the lower plate are arranged opposite to each other, and the upper plate and the lower plate are connected by the connecting column and the nut.

3. A micro-squeezing test machine according to claim 1, characterized in that: The squeezing upper roller speed regulating rotation unit further includes a diaphragm elastic coupling (13), and the squeezing upper roller (12) and the squeezing upper roller motor (14) are connected via the diaphragm elastic coupling (13).

4. A micro-squeezing test machine according to claim 1, characterized in that: The squeezing upper roller speed regulating rotation unit further includes an intermediate support plate (7), the intermediate support plate (7) is fixed to the base (1) via a connecting column, and the squeezing upper roller motor (14) is fixed to the intermediate support plate (7).

5. The micro-squeezing test machine according to claim 1, characterized in that: A power detection monitor for the squeezing upper roller motor (14) is provided in the frequency conversion control cabinet (23) for detecting the power of the squeezing upper roller motor (14) in real time and adjusting the rotation speed and the squeezing line pressure.

6. A micro-squeezing testing machine according to any one of claims 1 to 5, characterized in that: The pressing lower roller (10) is a miniature shoe pressure roller, comprising a roller shaft (24), a shoe cover (25), a shoe plate tightening screw (26), a shoe pressure plate (27) and an elastic shoe cover (28). The roller shaft (24) is hollow, the elastic shoe cover (28) is fixed on the roller shaft (24), the shoe pressure plate (27) is located outside the elastic shoe cover (28) and is fixed on the roller surface, and an oil filling hole communicating with the axis of the roller shaft (24) is opened on the shoe pressure plate (27), the shoe cover (25) is provided on both sides of the shoe pressure plate (27), and the elastic shoe cover (28), the shoe pressure plate (27) and the roller shaft (24) surface form a closed oil pressure space.

7. A micro-squeezing test machine according to claim 6, characterized in that: The lower pressing roller (10) is replaced with another type of pressing roller to form a pressing pair of rollers together with the upper pressing roller (12).

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